Finding the Fourth Proportional to 13,087.86, 18,061.20 and 7,119.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,087.86 : 18,061.20 = 7,119.42 : x
2. Step 2: Convert to fraction form
   13,087.86/18,061.20 = 7,119.42/x
3. Step 3: Cross multiply
   13,087.86x = 18,061.20 × 7,119.42
4. Step 4: Simplify right side
   13,087.86x = 128,585,268.50
5. Step 5: Solve for x
   x = 128,585,268.50/13,087.86
6. Step 6: Final answer
   x = 9,824.77