Finding the Fourth Proportional to 31,109.30, 42,930.88 and 16,962.15

Step by Step Solution

1. Step 1: Write the proportion equation
   31,109.30 : 42,930.88 = 16,962.15 : x
2. Step 2: Convert to fraction form
   31,109.30/42,930.88 = 16,962.15/x
3. Step 3: Cross multiply
   31,109.30x = 42,930.88 × 16,962.15
4. Step 4: Simplify right side
   31,109.30x = 728,200,026.19
5. Step 5: Solve for x
   x = 728,200,026.19/31,109.30
6. Step 6: Final answer
   x = 23,407.79