Finding the Fourth Proportional to 1,152.79, 1,728.90 and 535.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.79 : 1,728.90 = 535.91 : x
2. Step 2: Convert to fraction form
   1,152.79/1,728.90 = 535.91/x
3. Step 3: Cross multiply
   1,152.79x = 1,728.90 × 535.91
4. Step 4: Simplify right side
   1,152.79x = 926,526.15
5. Step 5: Solve for x
   x = 926,526.15/1,152.79
6. Step 6: Final answer
   x = 803.73