Finding the Fourth Proportional to 31,061.41, 42,865.64 and 16,915.16

Step by Step Solution

1. Step 1: Write the proportion equation
   31,061.41 : 42,865.64 = 16,915.16 : x
2. Step 2: Convert to fraction form
   31,061.41/42,865.64 = 16,915.16/x
3. Step 3: Cross multiply
   31,061.41x = 42,865.64 × 16,915.16
4. Step 4: Simplify right side
   31,061.41x = 725,079,245.12
5. Step 5: Solve for x
   x = 725,079,245.12/31,061.41
6. Step 6: Final answer
   x = 23,343.41