Finding the Fourth Proportional to 1,528.93, 2,109.78 and 865.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.93 : 2,109.78 = 865.78 : x
2. Step 2: Convert to fraction form
   1,528.93/2,109.78 = 865.78/x
3. Step 3: Cross multiply
   1,528.93x = 2,109.78 × 865.78
4. Step 4: Simplify right side
   1,528.93x = 1,826,611.35
5. Step 5: Solve for x
   x = 1,826,611.35/1,528.93
6. Step 6: Final answer
   x = 1,194.70