Finding the Fourth Proportional to 31,143.08, 42,978.49 and 16,996.70

Step by Step Solution

1. Step 1: Write the proportion equation
   31,143.08 : 42,978.49 = 16,996.70 : x
2. Step 2: Convert to fraction form
   31,143.08/42,978.49 = 16,996.70/x
3. Step 3: Cross multiply
   31,143.08x = 42,978.49 × 16,996.70
4. Step 4: Simplify right side
   31,143.08x = 730,492,500.98
5. Step 5: Solve for x
   x = 730,492,500.98/31,143.08
6. Step 6: Final answer
   x = 23,456.01