Finding the Fourth Proportional to 12,539.15, 17,300.53 and 9,878.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,539.15 : 17,300.53 = 9,878.30 : x
2. Step 2: Convert to fraction form
   12,539.15/17,300.53 = 9,878.30/x
3. Step 3: Cross multiply
   12,539.15x = 17,300.53 × 9,878.30
4. Step 4: Simplify right side
   12,539.15x = 170,899,881.10
5. Step 5: Solve for x
   x = 170,899,881.10/12,539.15
6. Step 6: Final answer
   x = 13,629.30