Finding the Fourth Proportional to 2,390.71, 3,580.86 and 1,155.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.71 : 3,580.86 = 1,155.52 : x
2. Step 2: Convert to fraction form
   2,390.71/3,580.86 = 1,155.52/x
3. Step 3: Cross multiply
   2,390.71x = 3,580.86 × 1,155.52
4. Step 4: Simplify right side
   2,390.71x = 4,137,737.51
5. Step 5: Solve for x
   x = 4,137,737.51/2,390.71
6. Step 6: Final answer
   x = 1,730.76