Finding the Fourth Proportional to 2,547.49, 3,515.75 and 1,428.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,547.49 : 3,515.75 = 1,428.41 : x
2. Step 2: Convert to fraction form
   2,547.49/3,515.75 = 1,428.41/x
3. Step 3: Cross multiply
   2,547.49x = 3,515.75 × 1,428.41
4. Step 4: Simplify right side
   2,547.49x = 5,021,932.46
5. Step 5: Solve for x
   x = 5,021,932.46/2,547.49
6. Step 6: Final answer
   x = 1,971.33