Finding the Fourth Proportional to 31,025.07, 42,815.67 and 16,878.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,025.07 : 42,815.67 = 16,878.42 : x
2. Step 2: Convert to fraction form
   31,025.07/42,815.67 = 16,878.42/x
3. Step 3: Cross multiply
   31,025.07x = 42,815.67 × 16,878.42
4. Step 4: Simplify right side
   31,025.07x = 722,660,860.84
5. Step 5: Solve for x
   x = 722,660,860.84/31,025.07
6. Step 6: Final answer
   x = 23,292.80