Finding the Fourth Proportional to 72,220,139.50, 99,663,985.69 and 39,180,388.63

Step by Step Solution

1. Step 1: Write the proportion equation
   72,220,139.50 : 99,663,985.69 = 39,180,388.63 : x
2. Step 2: Convert to fraction form
   72,220,139.50/99,663,985.69 = 39,180,388.63/x
3. Step 3: Cross multiply
   72,220,139.50x = 99,663,985.69 × 39,180,388.63
4. Step 4: Simplify right side
   72,220,139.50x = 3,904,873,691,553,057
5. Step 5: Solve for x
   x = 3,904,873,691,553,057/72,220,139.50
6. Step 6: Final answer
   x = 54,069,041.11