Finding the Fourth Proportional to 1,200,445,654.69, 1,656,579,423.76 and 664,621,200.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200,445,654.69 : 1,656,579,423.76 = 664,621,200.62 : x
2. Step 2: Convert to fraction form
   1,200,445,654.69/1,656,579,423.76 = 664,621,200.62/x
3. Step 3: Cross multiply
   1,200,445,654.69x = 1,656,579,423.76 × 664,621,200.62
4. Step 4: Simplify right side
   1,200,445,654.69x = 1,100,997,805,541,758,976
5. Step 5: Solve for x
   x = 1,100,997,805,541,758,976/1,200,445,654.69
6. Step 6: Final answer
   x = 917,157,558.31