Finding the Fourth Proportional to 10,128.34, 15,181.90 and 5,679.48

Step by Step Solution

1. Step 1: Write the proportion equation
   10,128.34 : 15,181.90 = 5,679.48 : x
2. Step 2: Convert to fraction form
   10,128.34/15,181.90 = 5,679.48/x
3. Step 3: Cross multiply
   10,128.34x = 15,181.90 × 5,679.48
4. Step 4: Simplify right side
   10,128.34x = 86,225,340.15
5. Step 5: Solve for x
   x = 86,225,340.15/10,128.34
6. Step 6: Final answer
   x = 8,513.27