Finding the Fourth Proportional to 1,338.82, 1,845.75 and 990.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,338.82 : 1,845.75 = 990.34 : x
2. Step 2: Convert to fraction form
   1,338.82/1,845.75 = 990.34/x
3. Step 3: Cross multiply
   1,338.82x = 1,845.75 × 990.34
4. Step 4: Simplify right side
   1,338.82x = 1,827,920.06
5. Step 5: Solve for x
   x = 1,827,920.06/1,338.82
6. Step 6: Final answer
   x = 1,365.32