Finding the Fourth Proportional to 13,087.12, 18,060.42 and 7,782.52

Step by Step Solution

1. Step 1: Write the proportion equation
   13,087.12 : 18,060.42 = 7,782.52 : x
2. Step 2: Convert to fraction form
   13,087.12/18,060.42 = 7,782.52/x
3. Step 3: Cross multiply
   13,087.12x = 18,060.42 × 7,782.52
4. Step 4: Simplify right side
   13,087.12x = 140,555,579.86
5. Step 5: Solve for x
   x = 140,555,579.86/13,087.12
6. Step 6: Final answer
   x = 10,739.99