Finding the Fourth Proportional to 31,106.61, 42,930.45 and 17,681.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,106.61 : 42,930.45 = 17,681.18 : x
2. Step 2: Convert to fraction form
   31,106.61/42,930.45 = 17,681.18/x
3. Step 3: Cross multiply
   31,106.61x = 42,930.45 × 17,681.18
4. Step 4: Simplify right side
   31,106.61x = 759,060,799.28
5. Step 5: Solve for x
   x = 759,060,799.28/31,106.61
6. Step 6: Final answer
   x = 24,401.91