Finding the Fourth Proportional to 3,488.81, 5,233.51 and 990.02

Step by Step Solution

1. Step 1: Write the proportion equation
   3,488.81 : 5,233.51 = 990.02 : x
2. Step 2: Convert to fraction form
   3,488.81/5,233.51 = 990.02/x
3. Step 3: Cross multiply
   3,488.81x = 5,233.51 × 990.02
4. Step 4: Simplify right side
   3,488.81x = 5,181,293.89
5. Step 5: Solve for x
   x = 5,181,293.89/3,488.81
6. Step 6: Final answer
   x = 1,485.12