Finding the Fourth Proportional to 1,388.79, 2,083.83 and 608.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.79 : 2,083.83 = 608.69 : x
2. Step 2: Convert to fraction form
   1,388.79/2,083.83 = 608.69/x
3. Step 3: Cross multiply
   1,388.79x = 2,083.83 × 608.69
4. Step 4: Simplify right side
   1,388.79x = 1,268,411.69
5. Step 5: Solve for x
   x = 1,268,411.69/1,388.79
6. Step 6: Final answer
   x = 913.32