Finding the Fourth Proportional to 10,158.18, 15,239.57 and 5,478.09

Step by Step Solution

1. Step 1: Write the proportion equation
   10,158.18 : 15,239.57 = 5,478.09 : x
2. Step 2: Convert to fraction form
   10,158.18/15,239.57 = 5,478.09/x
3. Step 3: Cross multiply
   10,158.18x = 15,239.57 × 5,478.09
4. Step 4: Simplify right side
   10,158.18x = 83,483,651.48
5. Step 5: Solve for x
   x = 83,483,651.48/10,158.18
6. Step 6: Final answer
   x = 8,218.37