Finding the Fourth Proportional to 1,338.38, 1,847.61 and 890.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,338.38 : 1,847.61 = 890.99 : x
2. Step 2: Convert to fraction form
   1,338.38/1,847.61 = 890.99/x
3. Step 3: Cross multiply
   1,338.38x = 1,847.61 × 890.99
4. Step 4: Simplify right side
   1,338.38x = 1,646,197.58
5. Step 5: Solve for x
   x = 1,646,197.58/1,338.38
6. Step 6: Final answer
   x = 1,230.00