Finding the Fourth Proportional to 12,400.06, 17,111.91 and 7,685.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,400.06 : 17,111.91 = 7,685.50 : x
2. Step 2: Convert to fraction form
   12,400.06/17,111.91 = 7,685.50/x
3. Step 3: Cross multiply
   12,400.06x = 17,111.91 × 7,685.50
4. Step 4: Simplify right side
   12,400.06x = 131,513,584.31
5. Step 5: Solve for x
   x = 131,513,584.31/12,400.06
6. Step 6: Final answer
   x = 10,605.88