Finding the Fourth Proportional to 1,525.57, 2,288.42 and 485.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,525.57 : 2,288.42 = 485.55 : x
2. Step 2: Convert to fraction form
   1,525.57/2,288.42 = 485.55/x
3. Step 3: Cross multiply
   1,525.57x = 2,288.42 × 485.55
4. Step 4: Simplify right side
   1,525.57x = 1,111,142.33
5. Step 5: Solve for x
   x = 1,111,142.33/1,525.57
6. Step 6: Final answer
   x = 728.35