Finding the Fourth Proportional to 8,978.81, 13,468.28 and 3,135.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.81 : 13,468.28 = 3,135.42 : x
2. Step 2: Convert to fraction form
   8,978.81/13,468.28 = 3,135.42/x
3. Step 3: Cross multiply
   8,978.81x = 13,468.28 × 3,135.42
4. Step 4: Simplify right side
   8,978.81x = 42,228,698.80
5. Step 5: Solve for x
   x = 42,228,698.80/8,978.81
6. Step 6: Final answer
   x = 4,703.15