Finding the Fourth Proportional to 2,628.62, 3,632.72 and 2,155.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,628.62 : 3,632.72 = 2,155.78 : x
2. Step 2: Convert to fraction form
   2,628.62/3,632.72 = 2,155.78/x
3. Step 3: Cross multiply
   2,628.62x = 3,632.72 × 2,155.78
4. Step 4: Simplify right side
   2,628.62x = 7,831,345.12
5. Step 5: Solve for x
   x = 7,831,345.12/2,628.62
6. Step 6: Final answer
   x = 2,979.26