Finding the Fourth Proportional to 1,931.94, 2,893.86 and 1,640.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.94 : 2,893.86 = 1,640.75 : x
2. Step 2: Convert to fraction form
   1,931.94/2,893.86 = 1,640.75/x
3. Step 3: Cross multiply
   1,931.94x = 2,893.86 × 1,640.75
4. Step 4: Simplify right side
   1,931.94x = 4,748,086.33
5. Step 5: Solve for x
   x = 4,748,086.33/1,931.94
6. Step 6: Final answer
   x = 2,457.68