Finding the Fourth Proportional to 72,310.08, 99,717.81 and 56,388.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,310.08 : 99,717.81 = 56,388.72 : x
2. Step 2: Convert to fraction form
   72,310.08/99,717.81 = 56,388.72/x
3. Step 3: Cross multiply
   72,310.08x = 99,717.81 × 56,388.72
4. Step 4: Simplify right side
   72,310.08x = 5,622,959,667.10
5. Step 5: Solve for x
   x = 5,622,959,667.10/72,310.08
6. Step 6: Final answer
   x = 77,761.77