Finding the Fourth Proportional to 31,146.81, 42,986.70 and 17,715.47

Step by Step Solution

1. Step 1: Write the proportion equation
   31,146.81 : 42,986.70 = 17,715.47 : x
2. Step 2: Convert to fraction form
   31,146.81/42,986.70 = 17,715.47/x
3. Step 3: Cross multiply
   31,146.81x = 42,986.70 × 17,715.47
4. Step 4: Simplify right side
   31,146.81x = 761,529,500.22
5. Step 5: Solve for x
   x = 761,529,500.22/31,146.81
6. Step 6: Final answer
   x = 24,449.68