Finding the Fourth Proportional to 31,108.90, 42,930.27 and 17,680.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,108.90 : 42,930.27 = 17,680.18 : x
2. Step 2: Convert to fraction form
   31,108.90/42,930.27 = 17,680.18/x
3. Step 3: Cross multiply
   31,108.90x = 42,930.27 × 17,680.18
4. Step 4: Simplify right side
   31,108.90x = 759,014,901.05
5. Step 5: Solve for x
   x = 759,014,901.05/31,108.90
6. Step 6: Final answer
   x = 24,398.64