Finding the Fourth Proportional to 31,071.45, 42,877.12 and 17,640.91

Step by Step Solution

1. Step 1: Write the proportion equation
   31,071.45 : 42,877.12 = 17,640.91 : x
2. Step 2: Convert to fraction form
   31,071.45/42,877.12 = 17,640.91/x
3. Step 3: Cross multiply
   31,071.45x = 42,877.12 × 17,640.91
4. Step 4: Simplify right side
   31,071.45x = 756,391,627.76
5. Step 5: Solve for x
   x = 756,391,627.76/31,071.45
6. Step 6: Final answer
   x = 24,343.62