Finding the Fourth Proportional to 31,089.81, 42,904.85 and 16,943.57

Step by Step Solution

1. Step 1: Write the proportion equation
   31,089.81 : 42,904.85 = 16,943.57 : x
2. Step 2: Convert to fraction form
   31,089.81/42,904.85 = 16,943.57/x
3. Step 3: Cross multiply
   31,089.81x = 42,904.85 × 16,943.57
4. Step 4: Simplify right side
   31,089.81x = 726,961,329.31
5. Step 5: Solve for x
   x = 726,961,329.31/31,089.81
6. Step 6: Final answer
   x = 23,382.62