Finding the Fourth Proportional to 72,145,221.89, 99,566,704.79 and 39,556,472.45

Step by Step Solution

1. Step 1: Write the proportion equation
   72,145,221.89 : 99,566,704.79 = 39,556,472.45 : x
2. Step 2: Convert to fraction form
   72,145,221.89/99,566,704.79 = 39,556,472.45/x
3. Step 3: Cross multiply
   72,145,221.89x = 99,566,704.79 × 39,556,472.45
4. Step 4: Simplify right side
   72,145,221.89x = 3,938,507,614,962,918.50
5. Step 5: Solve for x
   x = 3,938,507,614,962,918.50/72,145,221.89
6. Step 6: Final answer
   x = 54,591,385.43