Finding the Fourth Proportional to 9,282.72, 12,810.16 and 5,091.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,282.72 : 12,810.16 = 5,091.20 : x
2. Step 2: Convert to fraction form
   9,282.72/12,810.16 = 5,091.20/x
3. Step 3: Cross multiply
   9,282.72x = 12,810.16 × 5,091.20
4. Step 4: Simplify right side
   9,282.72x = 65,219,086.59
5. Step 5: Solve for x
   x = 65,219,086.59/9,282.72
6. Step 6: Final answer
   x = 7,025.86