Finding the Fourth Proportional to 1,007.59, 1,390.63 and 614.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.59 : 1,390.63 = 614.54 : x
2. Step 2: Convert to fraction form
   1,007.59/1,390.63 = 614.54/x
3. Step 3: Cross multiply
   1,007.59x = 1,390.63 × 614.54
4. Step 4: Simplify right side
   1,007.59x = 854,597.76
5. Step 5: Solve for x
   x = 854,597.76/1,007.59
6. Step 6: Final answer
   x = 848.16