Finding the Fourth Proportional to 12,559.10, 17,320.29 and 9,380.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,559.10 : 17,320.29 = 9,380.10 : x
2. Step 2: Convert to fraction form
   12,559.10/17,320.29 = 9,380.10/x
3. Step 3: Cross multiply
   12,559.10x = 17,320.29 × 9,380.10
4. Step 4: Simplify right side
   12,559.10x = 162,465,965.63
5. Step 5: Solve for x
   x = 162,465,965.63/12,559.10
6. Step 6: Final answer
   x = 12,936.12