Finding the Fourth Proportional to 2,547.74, 3,515.56 and 1,428.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,547.74 : 3,515.56 = 1,428.53 : x
2. Step 2: Convert to fraction form
   2,547.74/3,515.56 = 1,428.53/x
3. Step 3: Cross multiply
   2,547.74x = 3,515.56 × 1,428.53
4. Step 4: Simplify right side
   2,547.74x = 5,022,061.78
5. Step 5: Solve for x
   x = 5,022,061.78/2,547.74
6. Step 6: Final answer
   x = 1,971.18