Finding the Fourth Proportional to 12,387.50, 17,090.58 and 7,078.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,387.50 : 17,090.58 = 7,078.56 : x
2. Step 2: Convert to fraction form
   12,387.50/17,090.58 = 7,078.56/x
3. Step 3: Cross multiply
   12,387.50x = 17,090.58 × 7,078.56
4. Step 4: Simplify right side
   12,387.50x = 120,976,695.96
5. Step 5: Solve for x
   x = 120,976,695.96/12,387.50
6. Step 6: Final answer
   x = 9,766.03