Finding the Fourth Proportional to 1,192.16, 1,644.89 and 720.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,192.16 : 1,644.89 = 720.34 : x
2. Step 2: Convert to fraction form
   1,192.16/1,644.89 = 720.34/x
3. Step 3: Cross multiply
   1,192.16x = 1,644.89 × 720.34
4. Step 4: Simplify right side
   1,192.16x = 1,184,872.35
5. Step 5: Solve for x
   x = 1,184,872.35/1,192.16
6. Step 6: Final answer
   x = 993.88