Finding the Fourth Proportional to 31,129.56, 42,955.89 and 17,698.20

Step by Step Solution

1. Step 1: Write the proportion equation
   31,129.56 : 42,955.89 = 17,698.20 : x
2. Step 2: Convert to fraction form
   31,129.56/42,955.89 = 17,698.20/x
3. Step 3: Cross multiply
   31,129.56x = 42,955.89 × 17,698.20
4. Step 4: Simplify right side
   31,129.56x = 760,241,932.40
5. Step 5: Solve for x
   x = 760,241,932.40/31,129.56
6. Step 6: Final answer
   x = 24,421.87