Finding the Fourth Proportional to 9,270.10, 12,789.48 and 6,436.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,270.10 : 12,789.48 = 6,436.72 : x
2. Step 2: Convert to fraction form
   9,270.10/12,789.48 = 6,436.72/x
3. Step 3: Cross multiply
   9,270.10x = 12,789.48 × 6,436.72
4. Step 4: Simplify right side
   9,270.10x = 82,322,301.71
5. Step 5: Solve for x
   x = 82,322,301.71/9,270.10
6. Step 6: Final answer
   x = 8,880.41