Finding the Fourth Proportional to 31,145.31, 42,980.82 and 16,998.15

Step by Step Solution

1. Step 1: Write the proportion equation
   31,145.31 : 42,980.82 = 16,998.15 : x
2. Step 2: Convert to fraction form
   31,145.31/42,980.82 = 16,998.15/x
3. Step 3: Cross multiply
   31,145.31x = 42,980.82 × 16,998.15
4. Step 4: Simplify right side
   31,145.31x = 730,594,425.48
5. Step 5: Solve for x
   x = 730,594,425.48/31,145.31
6. Step 6: Final answer
   x = 23,457.61