Finding the Fourth Proportional to 9,260.72, 12,779.78 and 5,281.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,260.72 : 12,779.78 = 5,281.80 : x
2. Step 2: Convert to fraction form
   9,260.72/12,779.78 = 5,281.80/x
3. Step 3: Cross multiply
   9,260.72x = 12,779.78 × 5,281.80
4. Step 4: Simplify right side
   9,260.72x = 67,500,242.00
5. Step 5: Solve for x
   x = 67,500,242.00/9,260.72
6. Step 6: Final answer
   x = 7,288.88