Finding the Fourth Proportional to 8,155.78, 12,238.31 and 3,475.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,155.78 : 12,238.31 = 3,475.30 : x
2. Step 2: Convert to fraction form
   8,155.78/12,238.31 = 3,475.30/x
3. Step 3: Cross multiply
   8,155.78x = 12,238.31 × 3,475.30
4. Step 4: Simplify right side
   8,155.78x = 42,531,720.17
5. Step 5: Solve for x
   x = 42,531,720.17/8,155.78
6. Step 6: Final answer
   x = 5,214.92