Finding the Fourth Proportional to 31,142.85, 42,978.08 and 17,716.03

Step by Step Solution

1. Step 1: Write the proportion equation
   31,142.85 : 42,978.08 = 17,716.03 : x
2. Step 2: Convert to fraction form
   31,142.85/42,978.08 = 17,716.03/x
3. Step 3: Cross multiply
   31,142.85x = 42,978.08 × 17,716.03
4. Step 4: Simplify right side
   31,142.85x = 761,400,866.04
5. Step 5: Solve for x
   x = 761,400,866.04/31,142.85
6. Step 6: Final answer
   x = 24,448.66