Finding the Fourth Proportional to 56,680.50, 78,219.10 and 31,530

Step by Step Solution

1. Step 1: Write the proportion equation
   56,680.50 : 78,219.10 = 31,530 : x
2. Step 2: Convert to fraction form
   56,680.50/78,219.10 = 31,530/x
3. Step 3: Cross multiply
   56,680.50x = 78,219.10 × 31,530
4. Step 4: Simplify right side
   56,680.50x = 2,466,248,223
5. Step 5: Solve for x
   x = 2,466,248,223/56,680.50
6. Step 6: Final answer
   x = 43,511.41