Finding the Fourth Proportional to 1,308.69, 1,962.59 and 383.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.69 : 1,962.59 = 383.99 : x
2. Step 2: Convert to fraction form
   1,308.69/1,962.59 = 383.99/x
3. Step 3: Cross multiply
   1,308.69x = 1,962.59 × 383.99
4. Step 4: Simplify right side
   1,308.69x = 753,603.20
5. Step 5: Solve for x
   x = 753,603.20/1,308.69
6. Step 6: Final answer
   x = 575.85