Finding the Fourth Proportional to 1,192.52, 1,645.72 and 720.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,192.52 : 1,645.72 = 720.57 : x
2. Step 2: Convert to fraction form
   1,192.52/1,645.72 = 720.57/x
3. Step 3: Cross multiply
   1,192.52x = 1,645.72 × 720.57
4. Step 4: Simplify right side
   1,192.52x = 1,185,856.20
5. Step 5: Solve for x
   x = 1,185,856.20/1,192.52
6. Step 6: Final answer
   x = 994.41