Finding the Fourth Proportional to 2,547.22, 3,515.31 and 1,428.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,547.22 : 3,515.31 = 1,428.52 : x
2. Step 2: Convert to fraction form
   2,547.22/3,515.31 = 1,428.52/x
3. Step 3: Cross multiply
   2,547.22x = 3,515.31 × 1,428.52
4. Step 4: Simplify right side
   2,547.22x = 5,021,681.85
5. Step 5: Solve for x
   x = 5,021,681.85/2,547.22
6. Step 6: Final answer
   x = 1,971.44