Finding the Fourth Proportional to 1,085.50, 1,498.53 and 1,020.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.50 : 1,498.53 = 1,020.70 : x
2. Step 2: Convert to fraction form
   1,085.50/1,498.53 = 1,020.70/x
3. Step 3: Cross multiply
   1,085.50x = 1,498.53 × 1,020.70
4. Step 4: Simplify right side
   1,085.50x = 1,529,549.57
5. Step 5: Solve for x
   x = 1,529,549.57/1,085.50
6. Step 6: Final answer
   x = 1,409.07