Finding the Fourth Proportional to 8,436.72, 12,659.38 and 5,112.92

Step by Step Solution

1. Step 1: Write the proportion equation
   8,436.72 : 12,659.38 = 5,112.92 : x
2. Step 2: Convert to fraction form
   8,436.72/12,659.38 = 5,112.92/x
3. Step 3: Cross multiply
   8,436.72x = 12,659.38 × 5,112.92
4. Step 4: Simplify right side
   8,436.72x = 64,726,397.19
5. Step 5: Solve for x
   x = 64,726,397.19/8,436.72
6. Step 6: Final answer
   x = 7,671.99