Finding the Fourth Proportional to 1,438.31, 1,984.88 and 841.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.31 : 1,984.88 = 841.22 : x
2. Step 2: Convert to fraction form
   1,438.31/1,984.88 = 841.22/x
3. Step 3: Cross multiply
   1,438.31x = 1,984.88 × 841.22
4. Step 4: Simplify right side
   1,438.31x = 1,669,720.75
5. Step 5: Solve for x
   x = 1,669,720.75/1,438.31
6. Step 6: Final answer
   x = 1,160.89