Finding the Fourth Proportional to 31,106.78, 42,928.02 and 16,959.74

Step by Step Solution

1. Step 1: Write the proportion equation
   31,106.78 : 42,928.02 = 16,959.74 : x
2. Step 2: Convert to fraction form
   31,106.78/42,928.02 = 16,959.74/x
3. Step 3: Cross multiply
   31,106.78x = 42,928.02 × 16,959.74
4. Step 4: Simplify right side
   31,106.78x = 728,048,057.91
5. Step 5: Solve for x
   x = 728,048,057.91/31,106.78
6. Step 6: Final answer
   x = 23,404.80