Finding the Fourth Proportional to 8,978.56, 13,467.90 and 3,135.17

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.56 : 13,467.90 = 3,135.17 : x
2. Step 2: Convert to fraction form
   8,978.56/13,467.90 = 3,135.17/x
3. Step 3: Cross multiply
   8,978.56x = 13,467.90 × 3,135.17
4. Step 4: Simplify right side
   8,978.56x = 42,224,156.04
5. Step 5: Solve for x
   x = 42,224,156.04/8,978.56
6. Step 6: Final answer
   x = 4,702.78