Finding the Fourth Proportional to 1,200.15, 1,656.37 and 728.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.15 : 1,656.37 = 728.10 : x
2. Step 2: Convert to fraction form
   1,200.15/1,656.37 = 728.10/x
3. Step 3: Cross multiply
   1,200.15x = 1,656.37 × 728.10
4. Step 4: Simplify right side
   1,200.15x = 1,206,003.00
5. Step 5: Solve for x
   x = 1,206,003.00/1,200.15
6. Step 6: Final answer
   x = 1,004.88