Finding the Fourth Proportional to 1,164.56, 1,607.10 and 640.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,164.56 : 1,607.10 = 640.58 : x
2. Step 2: Convert to fraction form
   1,164.56/1,607.10 = 640.58/x
3. Step 3: Cross multiply
   1,164.56x = 1,607.10 × 640.58
4. Step 4: Simplify right side
   1,164.56x = 1,029,476.12
5. Step 5: Solve for x
   x = 1,029,476.12/1,164.56
6. Step 6: Final answer
   x = 884.00