Finding the Fourth Proportional to 1,338.47, 1,998.81 and 1,323.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,338.47 : 1,998.81 = 1,323.99 : x
2. Step 2: Convert to fraction form
   1,338.47/1,998.81 = 1,323.99/x
3. Step 3: Cross multiply
   1,338.47x = 1,998.81 × 1,323.99
4. Step 4: Simplify right side
   1,338.47x = 2,646,404.45
5. Step 5: Solve for x
   x = 2,646,404.45/1,338.47
6. Step 6: Final answer
   x = 1,977.19