Finding the Fourth Proportional to 31,128.85, 42,961.49 and 17,702.12

Step by Step Solution

1. Step 1: Write the proportion equation
   31,128.85 : 42,961.49 = 17,702.12 : x
2. Step 2: Convert to fraction form
   31,128.85/42,961.49 = 17,702.12/x
3. Step 3: Cross multiply
   31,128.85x = 42,961.49 × 17,702.12
4. Step 4: Simplify right side
   31,128.85x = 760,509,236.55
5. Step 5: Solve for x
   x = 760,509,236.55/31,128.85
6. Step 6: Final answer
   x = 24,431.01