Finding the Fourth Proportional to 1,513.32, 2,087.40 and 990.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,513.32 : 2,087.40 = 990.04 : x
2. Step 2: Convert to fraction form
   1,513.32/2,087.40 = 990.04/x
3. Step 3: Cross multiply
   1,513.32x = 2,087.40 × 990.04
4. Step 4: Simplify right side
   1,513.32x = 2,066,609.50
5. Step 5: Solve for x
   x = 2,066,609.50/1,513.32
6. Step 6: Final answer
   x = 1,365.61