Finding the Fourth Proportional to 2,547.90, 3,516.27 and 1,428.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,547.90 : 3,516.27 = 1,428.91 : x
2. Step 2: Convert to fraction form
   2,547.90/3,516.27 = 1,428.91/x
3. Step 3: Cross multiply
   2,547.90x = 3,516.27 × 1,428.91
4. Step 4: Simplify right side
   2,547.90x = 5,024,437.76
5. Step 5: Solve for x
   x = 5,024,437.76/2,547.90
6. Step 6: Final answer
   x = 1,971.99