Finding the Fourth Proportional to 56,630.09, 78,140.92 and 31,137.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,630.09 : 78,140.92 = 31,137.50 : x
2. Step 2: Convert to fraction form
   56,630.09/78,140.92 = 31,137.50/x
3. Step 3: Cross multiply
   56,630.09x = 78,140.92 × 31,137.50
4. Step 4: Simplify right side
   56,630.09x = 2,433,112,740.81
5. Step 5: Solve for x
   x = 2,433,112,740.81/56,630.09
6. Step 6: Final answer
   x = 42,965.02