Finding the Fourth Proportional to 1,127.72, 1,690.78 and 433.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.72 : 1,690.78 = 433.96 : x
2. Step 2: Convert to fraction form
   1,127.72/1,690.78 = 433.96/x
3. Step 3: Cross multiply
   1,127.72x = 1,690.78 × 433.96
4. Step 4: Simplify right side
   1,127.72x = 733,730.89
5. Step 5: Solve for x
   x = 733,730.89/1,127.72
6. Step 6: Final answer
   x = 650.63