Finding the Fourth Proportional to 1,525.72, 2,288.76 and 485.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,525.72 : 2,288.76 = 485.78 : x
2. Step 2: Convert to fraction form
   1,525.72/2,288.76 = 485.78/x
3. Step 3: Cross multiply
   1,525.72x = 2,288.76 × 485.78
4. Step 4: Simplify right side
   1,525.72x = 1,111,833.83
5. Step 5: Solve for x
   x = 1,111,833.83/1,525.72
6. Step 6: Final answer
   x = 728.73