Finding the Fourth Proportional to 1,156.36, 1,733.82 and 643.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,156.36 : 1,733.82 = 643.72 : x
2. Step 2: Convert to fraction form
   1,156.36/1,733.82 = 643.72/x
3. Step 3: Cross multiply
   1,156.36x = 1,733.82 × 643.72
4. Step 4: Simplify right side
   1,156.36x = 1,116,094.61
5. Step 5: Solve for x
   x = 1,116,094.61/1,156.36
6. Step 6: Final answer
   x = 965.18