Finding the Fourth Proportional to 1,528.55, 2,109.15 and 865.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.55 : 2,109.15 = 865.25 : x
2. Step 2: Convert to fraction form
   1,528.55/2,109.15 = 865.25/x
3. Step 3: Cross multiply
   1,528.55x = 2,109.15 × 865.25
4. Step 4: Simplify right side
   1,528.55x = 1,824,931.49
5. Step 5: Solve for x
   x = 1,824,931.49/1,528.55
6. Step 6: Final answer
   x = 1,193.90