Finding the Fourth Proportional to 9,060.89, 12,587.75 and 8,979.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,060.89 : 12,587.75 = 8,979.80 : x
2. Step 2: Convert to fraction form
   9,060.89/12,587.75 = 8,979.80/x
3. Step 3: Cross multiply
   9,060.89x = 12,587.75 × 8,979.80
4. Step 4: Simplify right side
   9,060.89x = 113,035,369.61
5. Step 5: Solve for x
   x = 113,035,369.61/9,060.89
6. Step 6: Final answer
   x = 12,475.09