Finding the Fourth Proportional to 31,061.55, 42,865.01 and 16,915.30

Step by Step Solution

1. Step 1: Write the proportion equation
   31,061.55 : 42,865.01 = 16,915.30 : x
2. Step 2: Convert to fraction form
   31,061.55/42,865.01 = 16,915.30/x
3. Step 3: Cross multiply
   31,061.55x = 42,865.01 × 16,915.30
4. Step 4: Simplify right side
   31,061.55x = 725,074,503.65
5. Step 5: Solve for x
   x = 725,074,503.65/31,061.55
6. Step 6: Final answer
   x = 23,343.15