Finding the Fourth Proportional to 1,084.23, 1,495.98 and 664.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,084.23 : 1,495.98 = 664.61 : x
2. Step 2: Convert to fraction form
   1,084.23/1,495.98 = 664.61/x
3. Step 3: Cross multiply
   1,084.23x = 1,495.98 × 664.61
4. Step 4: Simplify right side
   1,084.23x = 994,235.79
5. Step 5: Solve for x
   x = 994,235.79/1,084.23
6. Step 6: Final answer
   x = 917.00