Finding the Fourth Proportional to 1,485.71, 2,223.90 and 1,020.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,485.71 : 2,223.90 = 1,020.77 : x
2. Step 2: Convert to fraction form
   1,485.71/2,223.90 = 1,020.77/x
3. Step 3: Cross multiply
   1,485.71x = 2,223.90 × 1,020.77
4. Step 4: Simplify right side
   1,485.71x = 2,270,085.30
5. Step 5: Solve for x
   x = 2,270,085.30/1,485.71
6. Step 6: Final answer
   x = 1,527.95