Finding the Fourth Proportional to 2,547.96, 3,515.30 and 1,428.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,547.96 : 3,515.30 = 1,428.74 : x
2. Step 2: Convert to fraction form
   2,547.96/3,515.30 = 1,428.74/x
3. Step 3: Cross multiply
   2,547.96x = 3,515.30 × 1,428.74
4. Step 4: Simplify right side
   2,547.96x = 5,022,449.72
5. Step 5: Solve for x
   x = 5,022,449.72/2,547.96
6. Step 6: Final answer
   x = 1,971.17