Finding the Fourth Proportional to 2,374.72, 3,561.67 and 642.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,374.72 : 3,561.67 = 642.94 : x
2. Step 2: Convert to fraction form
   2,374.72/3,561.67 = 642.94/x
3. Step 3: Cross multiply
   2,374.72x = 3,561.67 × 642.94
4. Step 4: Simplify right side
   2,374.72x = 2,289,932.01
5. Step 5: Solve for x
   x = 2,289,932.01/2,374.72
6. Step 6: Final answer
   x = 964.30