Finding the Fourth Proportional to 11,870.14, 17,811.40 and 8,610.14

Step by Step Solution

1. Step 1: Write the proportion equation
   11,870.14 : 17,811.40 = 8,610.14 : x
2. Step 2: Convert to fraction form
   11,870.14/17,811.40 = 8,610.14/x
3. Step 3: Cross multiply
   11,870.14x = 17,811.40 × 8,610.14
4. Step 4: Simplify right side
   11,870.14x = 153,358,604.55
5. Step 5: Solve for x
   x = 153,358,604.55/11,870.14
6. Step 6: Final answer
   x = 12,919.70