Finding the Fourth Proportional to 31,072.40, 42,880.12 and 16,925.12

Step by Step Solution

1. Step 1: Write the proportion equation
   31,072.40 : 42,880.12 = 16,925.12 : x
2. Step 2: Convert to fraction form
   31,072.40/42,880.12 = 16,925.12/x
3. Step 3: Cross multiply
   31,072.40x = 42,880.12 × 16,925.12
4. Step 4: Simplify right side
   31,072.40x = 725,751,176.61
5. Step 5: Solve for x
   x = 725,751,176.61/31,072.40
6. Step 6: Final answer
   x = 23,356.78