Finding the Fourth Proportional to 31,071.18, 42,875.76 and 17,640

Step by Step Solution

1. Step 1: Write the proportion equation
   31,071.18 : 42,875.76 = 17,640 : x
2. Step 2: Convert to fraction form
   31,071.18/42,875.76 = 17,640/x
3. Step 3: Cross multiply
   31,071.18x = 42,875.76 × 17,640
4. Step 4: Simplify right side
   31,071.18x = 756,328,406.40
5. Step 5: Solve for x
   x = 756,328,406.40/31,071.18
6. Step 6: Final answer
   x = 24,341.80