Finding the Fourth Proportional to 2,547.56, 3,515.77 and 1,428.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,547.56 : 3,515.77 = 1,428.41 : x
2. Step 2: Convert to fraction form
   2,547.56/3,515.77 = 1,428.41/x
3. Step 3: Cross multiply
   2,547.56x = 3,515.77 × 1,428.41
4. Step 4: Simplify right side
   2,547.56x = 5,021,950.82
5. Step 5: Solve for x
   x = 5,021,950.82/2,547.56
6. Step 6: Final answer
   x = 1,971.28