Finding the Fourth Proportional to 1,152.68, 1,728.50 and 666.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.68 : 1,728.50 = 666.05 : x
2. Step 2: Convert to fraction form
   1,152.68/1,728.50 = 666.05/x
3. Step 3: Cross multiply
   1,152.68x = 1,728.50 × 666.05
4. Step 4: Simplify right side
   1,152.68x = 1,151,255.45
5. Step 5: Solve for x
   x = 1,151,255.45/1,152.68
6. Step 6: Final answer
   x = 998.77