Finding the Fourth Proportional to 31,087.61, 42,900.76 and 16,940.45

Step by Step Solution

1. Step 1: Write the proportion equation
   31,087.61 : 42,900.76 = 16,940.45 : x
2. Step 2: Convert to fraction form
   31,087.61/42,900.76 = 16,940.45/x
3. Step 3: Cross multiply
   31,087.61x = 42,900.76 × 16,940.45
4. Step 4: Simplify right side
   31,087.61x = 726,758,179.74
5. Step 5: Solve for x
   x = 726,758,179.74/31,087.61
6. Step 6: Final answer
   x = 23,377.75