Finding the Fourth Proportional to 8,470.72, 12,698.52 and 4,308.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,470.72 : 12,698.52 = 4,308.40 : x
2. Step 2: Convert to fraction form
   8,470.72/12,698.52 = 4,308.40/x
3. Step 3: Cross multiply
   8,470.72x = 12,698.52 × 4,308.40
4. Step 4: Simplify right side
   8,470.72x = 54,710,303.57
5. Step 5: Solve for x
   x = 54,710,303.57/8,470.72
6. Step 6: Final answer
   x = 6,458.75