Finding the Fourth Proportional to 31,145.62, 42,981 and 16,999.30

Step by Step Solution

1. Step 1: Write the proportion equation
   31,145.62 : 42,981 = 16,999.30 : x
2. Step 2: Convert to fraction form
   31,145.62/42,981 = 16,999.30/x
3. Step 3: Cross multiply
   31,145.62x = 42,981 × 16,999.30
4. Step 4: Simplify right side
   31,145.62x = 730,646,913.30
5. Step 5: Solve for x
   x = 730,646,913.30/31,145.62
6. Step 6: Final answer
   x = 23,459.06