Finding the Fourth Proportional to 2,215.40, 3,056.74 and 1,428.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.40 : 3,056.74 = 1,428.52 : x
2. Step 2: Convert to fraction form
   2,215.40/3,056.74 = 1,428.52/x
3. Step 3: Cross multiply
   2,215.40x = 3,056.74 × 1,428.52
4. Step 4: Simplify right side
   2,215.40x = 4,366,614.22
5. Step 5: Solve for x
   x = 4,366,614.22/2,215.40
6. Step 6: Final answer
   x = 1,971.03