Finding the Fourth Proportional to 8,911.89, 12,298.70 and 5,134.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,911.89 : 12,298.70 = 5,134.76 : x
2. Step 2: Convert to fraction form
   8,911.89/12,298.70 = 5,134.76/x
3. Step 3: Cross multiply
   8,911.89x = 12,298.70 × 5,134.76
4. Step 4: Simplify right side
   8,911.89x = 63,150,798.48
5. Step 5: Solve for x
   x = 63,150,798.48/8,911.89
6. Step 6: Final answer
   x = 7,086.13