Finding the Fourth Proportional to 2,547.45, 3,515.27 and 1,428.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,547.45 : 3,515.27 = 1,428.30 : x
2. Step 2: Convert to fraction form
   2,547.45/3,515.27 = 1,428.30/x
3. Step 3: Cross multiply
   2,547.45x = 3,515.27 × 1,428.30
4. Step 4: Simplify right side
   2,547.45x = 5,020,853.00
5. Step 5: Solve for x
   x = 5,020,853.00/2,547.45
6. Step 6: Final answer
   x = 1,970.93