Finding the Fourth Proportional to 2,145.60, 2,960.10 and 1,587.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.60 : 2,960.10 = 1,587.39 : x
2. Step 2: Convert to fraction form
   2,145.60/2,960.10 = 1,587.39/x
3. Step 3: Cross multiply
   2,145.60x = 2,960.10 × 1,587.39
4. Step 4: Simplify right side
   2,145.60x = 4,698,833.14
5. Step 5: Solve for x
   x = 4,698,833.14/2,145.60
6. Step 6: Final answer
   x = 2,189.99