Finding the Fourth Proportional to 8,300.20, 12,437.33 and 5,215.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,300.20 : 12,437.33 = 5,215.72 : x
2. Step 2: Convert to fraction form
   8,300.20/12,437.33 = 5,215.72/x
3. Step 3: Cross multiply
   8,300.20x = 12,437.33 × 5,215.72
4. Step 4: Simplify right side
   8,300.20x = 64,869,630.83
5. Step 5: Solve for x
   x = 64,869,630.83/8,300.20
6. Step 6: Final answer
   x = 7,815.43