Finding the Fourth Proportional to 72,309.58, 99,717.12 and 56,388.22

Step by Step Solution

1. Step 1: Write the proportion equation
   72,309.58 : 99,717.12 = 56,388.22 : x
2. Step 2: Convert to fraction form
   72,309.58/99,717.12 = 56,388.22/x
3. Step 3: Cross multiply
   72,309.58x = 99,717.12 × 56,388.22
4. Step 4: Simplify right side
   72,309.58x = 5,622,870,900.33
5. Step 5: Solve for x
   x = 5,622,870,900.33/72,309.58
6. Step 6: Final answer
   x = 77,761.08