Finding the Fourth Proportional to 8,978.96, 13,474.59 and 3,135.57

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.96 : 13,474.59 = 3,135.57 : x
2. Step 2: Convert to fraction form
   8,978.96/13,474.59 = 3,135.57/x
3. Step 3: Cross multiply
   8,978.96x = 13,474.59 × 3,135.57
4. Step 4: Simplify right side
   8,978.96x = 42,250,520.17
5. Step 5: Solve for x
   x = 42,250,520.17/8,978.96
6. Step 6: Final answer
   x = 4,705.51