Finding the Fourth Proportional to 3,081.40, 4,274.15 and 2,970.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,081.40 : 4,274.15 = 2,970.72 : x
2. Step 2: Convert to fraction form
   3,081.40/4,274.15 = 2,970.72/x
3. Step 3: Cross multiply
   3,081.40x = 4,274.15 × 2,970.72
4. Step 4: Simplify right side
   3,081.40x = 12,697,302.89
5. Step 5: Solve for x
   x = 12,697,302.89/3,081.40
6. Step 6: Final answer
   x = 4,120.63