Finding the Fourth Proportional to 1,558.87, 2,150.62 and 1,086.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,558.87 : 2,150.62 = 1,086.64 : x
2. Step 2: Convert to fraction form
   1,558.87/2,150.62 = 1,086.64/x
3. Step 3: Cross multiply
   1,558.87x = 2,150.62 × 1,086.64
4. Step 4: Simplify right side
   1,558.87x = 2,336,949.72
5. Step 5: Solve for x
   x = 2,336,949.72/1,558.87
6. Step 6: Final answer
   x = 1,499.13