Finding the Fourth Proportional to 56,571.12, 78,068.16 and 31,420.62

Step by Step Solution

1. Step 1: Write the proportion equation
   56,571.12 : 78,068.16 = 31,420.62 : x
2. Step 2: Convert to fraction form
   56,571.12/78,068.16 = 31,420.62/x
3. Step 3: Cross multiply
   56,571.12x = 78,068.16 × 31,420.62
4. Step 4: Simplify right side
   56,571.12x = 2,452,949,989.46
5. Step 5: Solve for x
   x = 2,452,949,989.46/56,571.12
6. Step 6: Final answer
   x = 43,360.46