Finding the Fourth Proportional to 2,547.72, 3,515.67 and 1,428.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,547.72 : 3,515.67 = 1,428.64 : x
2. Step 2: Convert to fraction form
   2,547.72/3,515.67 = 1,428.64/x
3. Step 3: Cross multiply
   2,547.72x = 3,515.67 × 1,428.64
4. Step 4: Simplify right side
   2,547.72x = 5,022,618.00
5. Step 5: Solve for x
   x = 5,022,618.00/2,547.72
6. Step 6: Final answer
   x = 1,971.42