Finding the Fourth Proportional to 31,088.81, 42,903.47 and 16,942.57

Step by Step Solution

1. Step 1: Write the proportion equation
   31,088.81 : 42,903.47 = 16,942.57 : x
2. Step 2: Convert to fraction form
   31,088.81/42,903.47 = 16,942.57/x
3. Step 3: Cross multiply
   31,088.81x = 42,903.47 × 16,942.57
4. Step 4: Simplify right side
   31,088.81x = 726,894,978.82
5. Step 5: Solve for x
   x = 726,894,978.82/31,088.81
6. Step 6: Final answer
   x = 23,381.24