Finding the Fourth Proportional to 1,006.59, 1,389.25 and 613.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,006.59 : 1,389.25 = 613.54 : x
2. Step 2: Convert to fraction form
   1,006.59/1,389.25 = 613.54/x
3. Step 3: Cross multiply
   1,006.59x = 1,389.25 × 613.54
4. Step 4: Simplify right side
   1,006.59x = 852,362.95
5. Step 5: Solve for x
   x = 852,362.95/1,006.59
6. Step 6: Final answer
   x = 846.78