Finding the Fourth Proportional to 56,540.62, 78,024.63 and 31,388.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,540.62 : 78,024.63 = 31,388.50 : x
2. Step 2: Convert to fraction form
   56,540.62/78,024.63 = 31,388.50/x
3. Step 3: Cross multiply
   56,540.62x = 78,024.63 × 31,388.50
4. Step 4: Simplify right side
   56,540.62x = 2,449,076,098.76
5. Step 5: Solve for x
   x = 2,449,076,098.76/56,540.62
6. Step 6: Final answer
   x = 43,315.34