Finding the Fourth Proportional to 31,115.18, 42,938.86 and 16,968.02

Step by Step Solution

1. Step 1: Write the proportion equation
   31,115.18 : 42,938.86 = 16,968.02 : x
2. Step 2: Convert to fraction form
   31,115.18/42,938.86 = 16,968.02/x
3. Step 3: Cross multiply
   31,115.18x = 42,938.86 × 16,968.02
4. Step 4: Simplify right side
   31,115.18x = 728,587,350.42
5. Step 5: Solve for x
   x = 728,587,350.42/31,115.18
6. Step 6: Final answer
   x = 23,415.82