Finding the Fourth Proportional to 31,143.35, 42,978.77 and 17,716.53

Step by Step Solution

1. Step 1: Write the proportion equation
   31,143.35 : 42,978.77 = 17,716.53 : x
2. Step 2: Convert to fraction form
   31,143.35/42,978.77 = 17,716.53/x
3. Step 3: Cross multiply
   31,143.35x = 42,978.77 × 17,716.53
4. Step 4: Simplify right side
   31,143.35x = 761,434,668.07
5. Step 5: Solve for x
   x = 761,434,668.07/31,143.35
6. Step 6: Final answer
   x = 24,449.35