Finding the Fourth Proportional to 17,870.81, 24,661.76 and 9,912.87

Step by Step Solution

1. Step 1: Write the proportion equation
   17,870.81 : 24,661.76 = 9,912.87 : x
2. Step 2: Convert to fraction form
   17,870.81/24,661.76 = 9,912.87/x
3. Step 3: Cross multiply
   17,870.81x = 24,661.76 × 9,912.87
4. Step 4: Simplify right side
   17,870.81x = 244,468,771.29
5. Step 5: Solve for x
   x = 244,468,771.29/17,870.81
6. Step 6: Final answer
   x = 13,679.79