Finding the Fourth Proportional to 2,547.83, 3,515.84 and 1,428.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,547.83 : 3,515.84 = 1,428.76 : x
2. Step 2: Convert to fraction form
   2,547.83/3,515.84 = 1,428.76/x
3. Step 3: Cross multiply
   2,547.83x = 3,515.84 × 1,428.76
4. Step 4: Simplify right side
   2,547.83x = 5,023,291.56
5. Step 5: Solve for x
   x = 5,023,291.56/2,547.83
6. Step 6: Final answer
   x = 1,971.60