Finding the Fourth Proportional to 8,465.31, 12,681.78 and 5,134.58

Step by Step Solution

1. Step 1: Write the proportion equation
   8,465.31 : 12,681.78 = 5,134.58 : x
2. Step 2: Convert to fraction form
   8,465.31/12,681.78 = 5,134.58/x
3. Step 3: Cross multiply
   8,465.31x = 12,681.78 × 5,134.58
4. Step 4: Simplify right side
   8,465.31x = 65,115,624.60
5. Step 5: Solve for x
   x = 65,115,624.60/8,465.31
6. Step 6: Final answer
   x = 7,692.05