Finding the Fourth Proportional to 42,640.66, 58,863.30 and 31,290.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,640.66 : 58,863.30 = 31,290.10 : x
2. Step 2: Convert to fraction form
   42,640.66/58,863.30 = 31,290.10/x
3. Step 3: Cross multiply
   42,640.66x = 58,863.30 × 31,290.10
4. Step 4: Simplify right side
   42,640.66x = 1,841,838,543.33
5. Step 5: Solve for x
   x = 1,841,838,543.33/42,640.66
6. Step 6: Final answer
   x = 43,194.42