Finding the Fourth Proportional to 12,419.73, 17,129.61 and 9,061.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,419.73 : 17,129.61 = 9,061.20 : x
2. Step 2: Convert to fraction form
   12,419.73/17,129.61 = 9,061.20/x
3. Step 3: Cross multiply
   12,419.73x = 17,129.61 × 9,061.20
4. Step 4: Simplify right side
   12,419.73x = 155,214,822.13
5. Step 5: Solve for x
   x = 155,214,822.13/12,419.73
6. Step 6: Final answer
   x = 12,497.44