Finding the Fourth Proportional to 2,155.91, 2,976.17 and 1,409.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.91 : 2,976.17 = 1,409.90 : x
2. Step 2: Convert to fraction form
   2,155.91/2,976.17 = 1,409.90/x
3. Step 3: Cross multiply
   2,155.91x = 2,976.17 × 1,409.90
4. Step 4: Simplify right side
   2,155.91x = 4,196,080.15
5. Step 5: Solve for x
   x = 4,196,080.15/2,155.91
6. Step 6: Final answer
   x = 1,946.32