Finding the Fourth Proportional to 72,159,940.78, 99,581,498.62 and 42,391,843.61

Step by Step Solution

1. Step 1: Write the proportion equation
   72,159,940.78 : 99,581,498.62 = 42,391,843.61 : x
2. Step 2: Convert to fraction form
   72,159,940.78/99,581,498.62 = 42,391,843.61/x
3. Step 3: Cross multiply
   72,159,940.78x = 99,581,498.62 × 42,391,843.61
4. Step 4: Simplify right side
   72,159,940.78x = 4,221,443,315,904,730
5. Step 5: Solve for x
   x = 4,221,443,315,904,730/72,159,940.78
6. Step 6: Final answer
   x = 58,501,202.61