Finding the Fourth Proportional to 1,359.42, 2,039.23 and 385.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.42 : 2,039.23 = 385.60 : x
2. Step 2: Convert to fraction form
   1,359.42/2,039.23 = 385.60/x
3. Step 3: Cross multiply
   1,359.42x = 2,039.23 × 385.60
4. Step 4: Simplify right side
   1,359.42x = 786,316.89
5. Step 5: Solve for x
   x = 786,316.89/1,359.42
6. Step 6: Final answer
   x = 578.42