Finding the Fourth Proportional to 2,079.96, 3,113.87 and 1,428.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,079.96 : 3,113.87 = 1,428.72 : x
2. Step 2: Convert to fraction form
   2,079.96/3,113.87 = 1,428.72/x
3. Step 3: Cross multiply
   2,079.96x = 3,113.87 × 1,428.72
4. Step 4: Simplify right side
   2,079.96x = 4,448,841.20
5. Step 5: Solve for x
   x = 4,448,841.20/2,079.96
6. Step 6: Final answer
   x = 2,138.91