Finding the Fourth Proportional to 31,070.79, 42,876.27 and 17,640.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,070.79 : 42,876.27 = 17,640.18 : x
2. Step 2: Convert to fraction form
   31,070.79/42,876.27 = 17,640.18/x
3. Step 3: Cross multiply
   31,070.79x = 42,876.27 × 17,640.18
4. Step 4: Simplify right side
   31,070.79x = 756,345,120.53
5. Step 5: Solve for x
   x = 756,345,120.53/31,070.79
6. Step 6: Final answer
   x = 24,342.64