Finding the Fourth Proportional to 72,306.58, 99,712.98 and 56,385.22

Step by Step Solution

1. Step 1: Write the proportion equation
   72,306.58 : 99,712.98 = 56,385.22 : x
2. Step 2: Convert to fraction form
   72,306.58/99,712.98 = 56,385.22/x
3. Step 3: Cross multiply
   72,306.58x = 99,712.98 × 56,385.22
4. Step 4: Simplify right side
   72,306.58x = 5,622,338,314.16
5. Step 5: Solve for x
   x = 5,622,338,314.16/72,306.58
6. Step 6: Final answer
   x = 77,756.94