Finding the Fourth Proportional to 10,085.18, 15,130.84 and 5,158.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,085.18 : 15,130.84 = 5,158.28 : x
2. Step 2: Convert to fraction form
   10,085.18/15,130.84 = 5,158.28/x
3. Step 3: Cross multiply
   10,085.18x = 15,130.84 × 5,158.28
4. Step 4: Simplify right side
   10,085.18x = 78,049,109.36
5. Step 5: Solve for x
   x = 78,049,109.36/10,085.18
6. Step 6: Final answer
   x = 7,738.99