Finding the Fourth Proportional to 1,488.50, 2,052.72 and 990.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.50 : 2,052.72 = 990.28 : x
2. Step 2: Convert to fraction form
   1,488.50/2,052.72 = 990.28/x
3. Step 3: Cross multiply
   1,488.50x = 2,052.72 × 990.28
4. Step 4: Simplify right side
   1,488.50x = 2,032,767.56
5. Step 5: Solve for x
   x = 2,032,767.56/1,488.50
6. Step 6: Final answer
   x = 1,365.65