Finding the Fourth Proportional to 1,069.31, 1,603.83 and 338.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,069.31 : 1,603.83 = 338.69 : x
2. Step 2: Convert to fraction form
   1,069.31/1,603.83 = 338.69/x
3. Step 3: Cross multiply
   1,069.31x = 1,603.83 × 338.69
4. Step 4: Simplify right side
   1,069.31x = 543,201.18
5. Step 5: Solve for x
   x = 543,201.18/1,069.31
6. Step 6: Final answer
   x = 507.99