Finding the Fourth Proportional to 8,911.42, 12,298.18 and 5,135.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,911.42 : 12,298.18 = 5,135.15 : x
2. Step 2: Convert to fraction form
   8,911.42/12,298.18 = 5,135.15/x
3. Step 3: Cross multiply
   8,911.42x = 12,298.18 × 5,135.15
4. Step 4: Simplify right side
   8,911.42x = 63,152,957.39
5. Step 5: Solve for x
   x = 63,152,957.39/8,911.42
6. Step 6: Final answer
   x = 7,086.75