Finding the Fourth Proportional to 1,327.56, 1,990.56 and 505.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,327.56 : 1,990.56 = 505.89 : x
2. Step 2: Convert to fraction form
   1,327.56/1,990.56 = 505.89/x
3. Step 3: Cross multiply
   1,327.56x = 1,990.56 × 505.89
4. Step 4: Simplify right side
   1,327.56x = 1,007,004.40
5. Step 5: Solve for x
   x = 1,007,004.40/1,327.56
6. Step 6: Final answer
   x = 758.54