Finding the Fourth Proportional to 2,155.98, 3,235.59 and 1,580.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.98 : 3,235.59 = 1,580.34 : x
2. Step 2: Convert to fraction form
   2,155.98/3,235.59 = 1,580.34/x
3. Step 3: Cross multiply
   2,155.98x = 3,235.59 × 1,580.34
4. Step 4: Simplify right side
   2,155.98x = 5,113,332.30
5. Step 5: Solve for x
   x = 5,113,332.30/2,155.98
6. Step 6: Final answer
   x = 2,371.70