Finding the Fourth Proportional to 139,968,796.80, 209,953,195.20 and 49,059,580.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,968,796.80 : 209,953,195.20 = 49,059,580.80 : x
2. Step 2: Convert to fraction form
   139,968,796.80/209,953,195.20 = 49,059,580.80/x
3. Step 3: Cross multiply
   139,968,796.80x = 209,953,195.20 × 49,059,580.80
4. Step 4: Simplify right side
   139,968,796.80x = 10,300,215,744,132,570
5. Step 5: Solve for x
   x = 10,300,215,744,132,570/139,968,796.80
6. Step 6: Final answer
   x = 73,589,371.20