Finding the Fourth Proportional to 10,158.78, 15,239.86 and 3,495

Step by Step Solution

1. Step 1: Write the proportion equation
   10,158.78 : 15,239.86 = 3,495 : x
2. Step 2: Convert to fraction form
   10,158.78/15,239.86 = 3,495/x
3. Step 3: Cross multiply
   10,158.78x = 15,239.86 × 3,495
4. Step 4: Simplify right side
   10,158.78x = 53,263,293.23
5. Step 5: Solve for x
   x = 53,263,293.23/10,158.78
6. Step 6: Final answer
   x = 5,243.08