Finding the Fourth Proportional to 10,128.78, 15,181.02 and 5,740.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,128.78 : 15,181.02 = 5,740.20 : x
2. Step 2: Convert to fraction form
   10,128.78/15,181.02 = 5,740.20/x
3. Step 3: Cross multiply
   10,128.78x = 15,181.02 × 5,740.20
4. Step 4: Simplify right side
   10,128.78x = 87,142,091.00
5. Step 5: Solve for x
   x = 87,142,091.00/10,128.78
6. Step 6: Final answer
   x = 8,603.41