Finding the Fourth Proportional to 31,100.78, 42,919.69 and 16,953.61

Step by Step Solution

1. Step 1: Write the proportion equation
   31,100.78 : 42,919.69 = 16,953.61 : x
2. Step 2: Convert to fraction form
   31,100.78/42,919.69 = 16,953.61/x
3. Step 3: Cross multiply
   31,100.78x = 42,919.69 × 16,953.61
4. Step 4: Simplify right side
   31,100.78x = 727,643,470.98
5. Step 5: Solve for x
   x = 727,643,470.98/31,100.78
6. Step 6: Final answer
   x = 23,396.31