Finding the Fourth Proportional to 31,159.76, 42,999.86 and 17,012.70

Step by Step Solution

1. Step 1: Write the proportion equation
   31,159.76 : 42,999.86 = 17,012.70 : x
2. Step 2: Convert to fraction form
   31,159.76/42,999.86 = 17,012.70/x
3. Step 3: Cross multiply
   31,159.76x = 42,999.86 × 17,012.70
4. Step 4: Simplify right side
   31,159.76x = 731,543,760.75
5. Step 5: Solve for x
   x = 731,543,760.75/31,159.76
6. Step 6: Final answer
   x = 23,477.20