Finding the Fourth Proportional to 31,131.12, 42,960.78 and 16,984.02

Step by Step Solution

1. Step 1: Write the proportion equation
   31,131.12 : 42,960.78 = 16,984.02 : x
2. Step 2: Convert to fraction form
   31,131.12/42,960.78 = 16,984.02/x
3. Step 3: Cross multiply
   31,131.12x = 42,960.78 × 16,984.02
4. Step 4: Simplify right side
   31,131.12x = 729,646,746.74
5. Step 5: Solve for x
   x = 729,646,746.74/31,131.12
6. Step 6: Final answer
   x = 23,437.86