Finding the Fourth Proportional to 1,032.59, 1,549.83 and 643.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,032.59 : 1,549.83 = 643.35 : x
2. Step 2: Convert to fraction form
   1,032.59/1,549.83 = 643.35/x
3. Step 3: Cross multiply
   1,032.59x = 1,549.83 × 643.35
4. Step 4: Simplify right side
   1,032.59x = 997,080.72
5. Step 5: Solve for x
   x = 997,080.72/1,032.59
6. Step 6: Final answer
   x = 965.61