Finding the Fourth Proportional to 1,020.18, 1,523.55 and 872.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.18 : 1,523.55 = 872.37 : x
2. Step 2: Convert to fraction form
   1,020.18/1,523.55 = 872.37/x
3. Step 3: Cross multiply
   1,020.18x = 1,523.55 × 872.37
4. Step 4: Simplify right side
   1,020.18x = 1,329,099.31
5. Step 5: Solve for x
   x = 1,329,099.31/1,020.18
6. Step 6: Final answer
   x = 1,302.81