Finding the Fourth Proportional to 8,978.16, 13,467.12 and 3,134.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.16 : 13,467.12 = 3,134.76 : x
2. Step 2: Convert to fraction form
   8,978.16/13,467.12 = 3,134.76/x
3. Step 3: Cross multiply
   8,978.16x = 13,467.12 × 3,134.76
4. Step 4: Simplify right side
   8,978.16x = 42,216,189.09
5. Step 5: Solve for x
   x = 42,216,189.09/8,978.16
6. Step 6: Final answer
   x = 4,702.10