Finding the Fourth Proportional to 1,164.84, 1,607.49 and 640.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,164.84 : 1,607.49 = 640.89 : x
2. Step 2: Convert to fraction form
   1,164.84/1,607.49 = 640.89/x
3. Step 3: Cross multiply
   1,164.84x = 1,607.49 × 640.89
4. Step 4: Simplify right side
   1,164.84x = 1,030,224.27
5. Step 5: Solve for x
   x = 1,030,224.27/1,164.84
6. Step 6: Final answer
   x = 884.43