Finding the Fourth Proportional to 2,931.94, 4,393.86 and 2,106.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,931.94 : 4,393.86 = 2,106.55 : x
2. Step 2: Convert to fraction form
   2,931.94/4,393.86 = 2,106.55/x
3. Step 3: Cross multiply
   2,931.94x = 4,393.86 × 2,106.55
4. Step 4: Simplify right side
   2,931.94x = 9,255,885.78
5. Step 5: Solve for x
   x = 9,255,885.78/2,931.94
6. Step 6: Final answer
   x = 3,156.92