Finding the Fourth Proportional to 1,164.82, 1,607.47 and 640.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,164.82 : 1,607.47 = 640.86 : x
2. Step 2: Convert to fraction form
   1,164.82/1,607.47 = 640.86/x
3. Step 3: Cross multiply
   1,164.82x = 1,607.47 × 640.86
4. Step 4: Simplify right side
   1,164.82x = 1,030,160.02
5. Step 5: Solve for x
   x = 1,030,160.02/1,164.82
6. Step 6: Final answer
   x = 884.39