Finding the Fourth Proportional to 2,547.52, 3,515.57 and 1,428.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,547.52 : 3,515.57 = 1,428.47 : x
2. Step 2: Convert to fraction form
   2,547.52/3,515.57 = 1,428.47/x
3. Step 3: Cross multiply
   2,547.52x = 3,515.57 × 1,428.47
4. Step 4: Simplify right side
   2,547.52x = 5,021,880.10
5. Step 5: Solve for x
   x = 5,021,880.10/2,547.52
6. Step 6: Final answer
   x = 1,971.28