Finding the Fourth Proportional to 2,155.79, 3,237.78 and 1,339.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.79 : 3,237.78 = 1,339.76 : x
2. Step 2: Convert to fraction form
   2,155.79/3,237.78 = 1,339.76/x
3. Step 3: Cross multiply
   2,155.79x = 3,237.78 × 1,339.76
4. Step 4: Simplify right side
   2,155.79x = 4,337,856.23
5. Step 5: Solve for x
   x = 4,337,856.23/2,155.79
6. Step 6: Final answer
   x = 2,012.19