Finding the Fourth Proportional to 13,134.24, 18,129.60 and 7,830.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,134.24 : 18,129.60 = 7,830.72 : x
2. Step 2: Convert to fraction form
   13,134.24/18,129.60 = 7,830.72/x
3. Step 3: Cross multiply
   13,134.24x = 18,129.60 × 7,830.72
4. Step 4: Simplify right side
   13,134.24x = 141,967,821.31
5. Step 5: Solve for x
   x = 141,967,821.31/13,134.24
6. Step 6: Final answer
   x = 10,808.99