Finding the Fourth Proportional to 1,359.56, 2,039.58 and 385.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.56 : 2,039.58 = 385.96 : x
2. Step 2: Convert to fraction form
   1,359.56/2,039.58 = 385.96/x
3. Step 3: Cross multiply
   1,359.56x = 2,039.58 × 385.96
4. Step 4: Simplify right side
   1,359.56x = 787,196.30
5. Step 5: Solve for x
   x = 787,196.30/1,359.56
6. Step 6: Final answer
   x = 579.01