Finding the Fourth Proportional to 8,978.15, 13,434.41 and 5,282.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.15 : 13,434.41 = 5,282.12 : x
2. Step 2: Convert to fraction form
   8,978.15/13,434.41 = 5,282.12/x
3. Step 3: Cross multiply
   8,978.15x = 13,434.41 × 5,282.12
4. Step 4: Simplify right side
   8,978.15x = 70,962,072.17
5. Step 5: Solve for x
   x = 70,962,072.17/8,978.15
6. Step 6: Final answer
   x = 7,903.87