Finding the Fourth Proportional to 1,438.43, 1,985.05 and 841.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.43 : 1,985.05 = 841.30 : x
2. Step 2: Convert to fraction form
   1,438.43/1,985.05 = 841.30/x
3. Step 3: Cross multiply
   1,438.43x = 1,985.05 × 841.30
4. Step 4: Simplify right side
   1,438.43x = 1,670,010.54
5. Step 5: Solve for x
   x = 1,670,010.54/1,438.43
6. Step 6: Final answer
   x = 1,161.00