Finding the Fourth Proportional to 1,586.71, 2,379.83 and 612.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,586.71 : 2,379.83 = 612.69 : x
2. Step 2: Convert to fraction form
   1,586.71/2,379.83 = 612.69/x
3. Step 3: Cross multiply
   1,586.71x = 2,379.83 × 612.69
4. Step 4: Simplify right side
   1,586.71x = 1,458,098.04
5. Step 5: Solve for x
   x = 1,458,098.04/1,586.71
6. Step 6: Final answer
   x = 918.94