Finding the Fourth Proportional to 8,478.25, 12,715.02 and 4,725.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,478.25 : 12,715.02 = 4,725.42 : x
2. Step 2: Convert to fraction form
   8,478.25/12,715.02 = 4,725.42/x
3. Step 3: Cross multiply
   8,478.25x = 12,715.02 × 4,725.42
4. Step 4: Simplify right side
   8,478.25x = 60,083,809.81
5. Step 5: Solve for x
   x = 60,083,809.81/8,478.25
6. Step 6: Final answer
   x = 7,086.82