Finding the Fourth Proportional to 1,558.71, 2,151.23 and 1,086.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,558.71 : 2,151.23 = 1,086.30 : x
2. Step 2: Convert to fraction form
   1,558.71/2,151.23 = 1,086.30/x
3. Step 3: Cross multiply
   1,558.71x = 2,151.23 × 1,086.30
4. Step 4: Simplify right side
   1,558.71x = 2,336,875.72
5. Step 5: Solve for x
   x = 2,336,875.72/1,558.71
6. Step 6: Final answer
   x = 1,499.24