Finding the Fourth Proportional to 1,020.35, 1,532.55 and 874.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.35 : 1,532.55 = 874.05 : x
2. Step 2: Convert to fraction form
   1,020.35/1,532.55 = 874.05/x
3. Step 3: Cross multiply
   1,020.35x = 1,532.55 × 874.05
4. Step 4: Simplify right side
   1,020.35x = 1,339,522.86
5. Step 5: Solve for x
   x = 1,339,522.86/1,020.35
6. Step 6: Final answer
   x = 1,312.80