Finding the Fourth Proportional to 2,712.72, 4,068.18 and 957.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,712.72 : 4,068.18 = 957.40 : x
2. Step 2: Convert to fraction form
   2,712.72/4,068.18 = 957.40/x
3. Step 3: Cross multiply
   2,712.72x = 4,068.18 × 957.40
4. Step 4: Simplify right side
   2,712.72x = 3,894,875.53
5. Step 5: Solve for x
   x = 3,894,875.53/2,712.72
6. Step 6: Final answer
   x = 1,435.78