Finding the Fourth Proportional to 56,217.17, 77,580.72 and 30,724.62

Step by Step Solution

1. Step 1: Write the proportion equation
   56,217.17 : 77,580.72 = 30,724.62 : x
2. Step 2: Convert to fraction form
   56,217.17/77,580.72 = 30,724.62/x
3. Step 3: Cross multiply
   56,217.17x = 77,580.72 × 30,724.62
4. Step 4: Simplify right side
   56,217.17x = 2,383,638,141.33
5. Step 5: Solve for x
   x = 2,383,638,141.33/56,217.17
6. Step 6: Final answer
   x = 42,400.53