Finding the Fourth Proportional to 31,071.28, 42,870.99 and 17,639.59

Step by Step Solution

1. Step 1: Write the proportion equation
   31,071.28 : 42,870.99 = 17,639.59 : x
2. Step 2: Convert to fraction form
   31,071.28/42,870.99 = 17,639.59/x
3. Step 3: Cross multiply
   31,071.28x = 42,870.99 × 17,639.59
4. Step 4: Simplify right side
   31,071.28x = 756,226,686.49
5. Step 5: Solve for x
   x = 756,226,686.49/31,071.28
6. Step 6: Final answer
   x = 24,338.45