Finding the Fourth Proportional to 1,438.89, 1,985.94 and 841.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.89 : 1,985.94 = 841.45 : x
2. Step 2: Convert to fraction form
   1,438.89/1,985.94 = 841.45/x
3. Step 3: Cross multiply
   1,438.89x = 1,985.94 × 841.45
4. Step 4: Simplify right side
   1,438.89x = 1,671,069.21
5. Step 5: Solve for x
   x = 1,671,069.21/1,438.89
6. Step 6: Final answer
   x = 1,161.36