Finding the Fourth Proportional to 2,547.72, 3,516.12 and 1,428.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,547.72 : 3,516.12 = 1,428.96 : x
2. Step 2: Convert to fraction form
   2,547.72/3,516.12 = 1,428.96/x
3. Step 3: Cross multiply
   2,547.72x = 3,516.12 × 1,428.96
4. Step 4: Simplify right side
   2,547.72x = 5,024,394.84
5. Step 5: Solve for x
   x = 5,024,394.84/2,547.72
6. Step 6: Final answer
   x = 1,972.11