Finding the Fourth Proportional to 1,288.72, 1,778.46 and 847.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.72 : 1,778.46 = 847.52 : x
2. Step 2: Convert to fraction form
   1,288.72/1,778.46 = 847.52/x
3. Step 3: Cross multiply
   1,288.72x = 1,778.46 × 847.52
4. Step 4: Simplify right side
   1,288.72x = 1,507,280.42
5. Step 5: Solve for x
   x = 1,507,280.42/1,288.72
6. Step 6: Final answer
   x = 1,169.59