Finding the Fourth Proportional to 1,200.63, 1,656.81 and 728.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.63 : 1,656.81 = 728.91 : x
2. Step 2: Convert to fraction form
   1,200.63/1,656.81 = 728.91/x
3. Step 3: Cross multiply
   1,200.63x = 1,656.81 × 728.91
4. Step 4: Simplify right side
   1,200.63x = 1,207,665.38
5. Step 5: Solve for x
   x = 1,207,665.38/1,200.63
6. Step 6: Final answer
   x = 1,005.86