Finding the Fourth Proportional to 1,559.59, 2,148.58 and 1,086.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.59 : 2,148.58 = 1,086.63 : x
2. Step 2: Convert to fraction form
   1,559.59/2,148.58 = 1,086.63/x
3. Step 3: Cross multiply
   1,559.59x = 2,148.58 × 1,086.63
4. Step 4: Simplify right side
   1,559.59x = 2,334,711.49
5. Step 5: Solve for x
   x = 2,334,711.49/1,559.59
6. Step 6: Final answer
   x = 1,497.00