Finding the Fourth Proportional to 1,442.39, 1,990.89 and 853.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.39 : 1,990.89 = 853.11 : x
2. Step 2: Convert to fraction form
   1,442.39/1,990.89 = 853.11/x
3. Step 3: Cross multiply
   1,442.39x = 1,990.89 × 853.11
4. Step 4: Simplify right side
   1,442.39x = 1,698,448.17
5. Step 5: Solve for x
   x = 1,698,448.17/1,442.39
6. Step 6: Final answer
   x = 1,177.53