Finding the Fourth Proportional to 1,020.27, 1,526.22 and 815.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.27 : 1,526.22 = 815.25 : x
2. Step 2: Convert to fraction form
   1,020.27/1,526.22 = 815.25/x
3. Step 3: Cross multiply
   1,020.27x = 1,526.22 × 815.25
4. Step 4: Simplify right side
   1,020.27x = 1,244,250.86
5. Step 5: Solve for x
   x = 1,244,250.86/1,020.27
6. Step 6: Final answer
   x = 1,219.53