Finding the Fourth Proportional to 12,421.80, 17,148.78 and 9,061.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,421.80 : 17,148.78 = 9,061.02 : x
2. Step 2: Convert to fraction form
   12,421.80/17,148.78 = 9,061.02/x
3. Step 3: Cross multiply
   12,421.80x = 17,148.78 × 9,061.02
4. Step 4: Simplify right side
   12,421.80x = 155,385,438.56
5. Step 5: Solve for x
   x = 155,385,438.56/12,421.80
6. Step 6: Final answer
   x = 12,509.09