Finding the Fourth Proportional to 11,870.85, 17,812.47 and 8,610.86

Step by Step Solution

1. Step 1: Write the proportion equation
   11,870.85 : 17,812.47 = 8,610.86 : x
2. Step 2: Convert to fraction form
   11,870.85/17,812.47 = 8,610.86/x
3. Step 3: Cross multiply
   11,870.85x = 17,812.47 × 8,610.86
4. Step 4: Simplify right side
   11,870.85x = 153,380,762.25
5. Step 5: Solve for x
   x = 153,380,762.25/11,870.85
6. Step 6: Final answer
   x = 12,920.79