Finding the Fourth Proportional to 31,089.68, 42,902.38 and 16,942.48

Step by Step Solution

1. Step 1: Write the proportion equation
   31,089.68 : 42,902.38 = 16,942.48 : x
2. Step 2: Convert to fraction form
   31,089.68/42,902.38 = 16,942.48/x
3. Step 3: Cross multiply
   31,089.68x = 42,902.38 × 16,942.48
4. Step 4: Simplify right side
   31,089.68x = 726,872,715.10
5. Step 5: Solve for x
   x = 726,872,715.10/31,089.68
6. Step 6: Final answer
   x = 23,379.87