Finding the Fourth Proportional to 8,298.57, 12,419.21 and 5,134.71

Step by Step Solution

1. Step 1: Write the proportion equation
   8,298.57 : 12,419.21 = 5,134.71 : x
2. Step 2: Convert to fraction form
   8,298.57/12,419.21 = 5,134.71/x
3. Step 3: Cross multiply
   8,298.57x = 12,419.21 × 5,134.71
4. Step 4: Simplify right side
   8,298.57x = 63,769,041.78
5. Step 5: Solve for x
   x = 63,769,041.78/8,298.57
6. Step 6: Final answer
   x = 7,684.34