Finding the Fourth Proportional to 2,375.31, 3,563.22 and 643.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,375.31 : 3,563.22 = 643.94 : x
2. Step 2: Convert to fraction form
   2,375.31/3,563.22 = 643.94/x
3. Step 3: Cross multiply
   2,375.31x = 3,563.22 × 643.94
4. Step 4: Simplify right side
   2,375.31x = 2,294,499.89
5. Step 5: Solve for x
   x = 2,294,499.89/2,375.31
6. Step 6: Final answer
   x = 965.98