Finding the Fourth Proportional to 2,547.43, 3,515.61 and 1,428.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,547.43 : 3,515.61 = 1,428.34 : x
2. Step 2: Convert to fraction form
   2,547.43/3,515.61 = 1,428.34/x
3. Step 3: Cross multiply
   2,547.43x = 3,515.61 × 1,428.34
4. Step 4: Simplify right side
   2,547.43x = 5,021,486.39
5. Step 5: Solve for x
   x = 5,021,486.39/2,547.43
6. Step 6: Final answer
   x = 1,971.20