Finding the Fourth Proportional to 3,393.36, 5,085.72 and 2,931.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,393.36 : 5,085.72 = 2,931.12 : x
2. Step 2: Convert to fraction form
   3,393.36/5,085.72 = 2,931.12/x
3. Step 3: Cross multiply
   3,393.36x = 5,085.72 × 2,931.12
4. Step 4: Simplify right side
   3,393.36x = 14,906,855.61
5. Step 5: Solve for x
   x = 14,906,855.61/3,393.36
6. Step 6: Final answer
   x = 4,392.95