Finding the Fourth Proportional to 1,941.32, 2,912.43 and 642.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,941.32 : 2,912.43 = 642.71 : x
2. Step 2: Convert to fraction form
   1,941.32/2,912.43 = 642.71/x
3. Step 3: Cross multiply
   1,941.32x = 2,912.43 × 642.71
4. Step 4: Simplify right side
   1,941.32x = 1,871,847.89
5. Step 5: Solve for x
   x = 1,871,847.89/1,941.32
6. Step 6: Final answer
   x = 964.21