Finding the Fourth Proportional to 1,661.39, 2,488.89 and 931.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.39 : 2,488.89 = 931.48 : x
2. Step 2: Convert to fraction form
   1,661.39/2,488.89 = 931.48/x
3. Step 3: Cross multiply
   1,661.39x = 2,488.89 × 931.48
4. Step 4: Simplify right side
   1,661.39x = 2,318,351.26
5. Step 5: Solve for x
   x = 2,318,351.26/1,661.39
6. Step 6: Final answer
   x = 1,395.43