Finding the Fourth Proportional to 1,528.30, 2,109.15 and 865.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.30 : 2,109.15 = 865.18 : x
2. Step 2: Convert to fraction form
   1,528.30/2,109.15 = 865.18/x
3. Step 3: Cross multiply
   1,528.30x = 2,109.15 × 865.18
4. Step 4: Simplify right side
   1,528.30x = 1,824,794.40
5. Step 5: Solve for x
   x = 1,824,794.40/1,528.30
6. Step 6: Final answer
   x = 1,194.00