Finding the Fourth Proportional to 1,441.21, 1,988.81 and 803.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.21 : 1,988.81 = 803.15 : x
2. Step 2: Convert to fraction form
   1,441.21/1,988.81 = 803.15/x
3. Step 3: Cross multiply
   1,441.21x = 1,988.81 × 803.15
4. Step 4: Simplify right side
   1,441.21x = 1,597,312.75
5. Step 5: Solve for x
   x = 1,597,312.75/1,441.21
6. Step 6: Final answer
   x = 1,108.31