Finding the Fourth Proportional to 31,155.80, 42,994.87 and 17,008.61

Step by Step Solution

1. Step 1: Write the proportion equation
   31,155.80 : 42,994.87 = 17,008.61 : x
2. Step 2: Convert to fraction form
   31,155.80/42,994.87 = 17,008.61/x
3. Step 3: Cross multiply
   31,155.80x = 42,994.87 × 17,008.61
4. Step 4: Simplify right side
   31,155.80x = 731,282,718.33
5. Step 5: Solve for x
   x = 731,282,718.33/31,155.80
6. Step 6: Final answer
   x = 23,471.80