Finding the Fourth Proportional to 1,378.69, 2,068.33 and 404.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.69 : 2,068.33 = 404.71 : x
2. Step 2: Convert to fraction form
   1,378.69/2,068.33 = 404.71/x
3. Step 3: Cross multiply
   1,378.69x = 2,068.33 × 404.71
4. Step 4: Simplify right side
   1,378.69x = 837,071.81
5. Step 5: Solve for x
   x = 837,071.81/1,378.69
6. Step 6: Final answer
   x = 607.15