Finding the Fourth Proportional to 1,217,957,386.54, 1,680,797,317.62 and 661,047,109.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,217,957,386.54 : 1,680,797,317.62 = 661,047,109.42 : x
2. Step 2: Convert to fraction form
   1,217,957,386.54/1,680,797,317.62 = 661,047,109.42/x
3. Step 3: Cross multiply
   1,217,957,386.54x = 1,680,797,317.62 × 661,047,109.42
4. Step 4: Simplify right side
   1,217,957,386.54x = 1,111,086,208,333,590,528
5. Step 5: Solve for x
   x = 1,111,086,208,333,590,528/1,217,957,386.54
6. Step 6: Final answer
   x = 912,253,762.42