Finding the Fourth Proportional to 1,000.86, 1,381.43 and 608.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,000.86 : 1,381.43 = 608.15 : x
2. Step 2: Convert to fraction form
   1,000.86/1,381.43 = 608.15/x
3. Step 3: Cross multiply
   1,000.86x = 1,381.43 × 608.15
4. Step 4: Simplify right side
   1,000.86x = 840,111.27
5. Step 5: Solve for x
   x = 840,111.27/1,000.86
6. Step 6: Final answer
   x = 839.39