Finding the Fourth Proportional to 31,070.30, 42,878.07 and 17,641.10

Step by Step Solution

1. Step 1: Write the proportion equation
   31,070.30 : 42,878.07 = 17,641.10 : x
2. Step 2: Convert to fraction form
   31,070.30/42,878.07 = 17,641.10/x
3. Step 3: Cross multiply
   31,070.30x = 42,878.07 × 17,641.10
4. Step 4: Simplify right side
   31,070.30x = 756,416,106.29
5. Step 5: Solve for x
   x = 756,416,106.29/31,070.30
6. Step 6: Final answer
   x = 24,345.31