Finding the Fourth Proportional to 1,404.74, 1,938.60 and 931.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.74 : 1,938.60 = 931.79 : x
2. Step 2: Convert to fraction form
   1,404.74/1,938.60 = 931.79/x
3. Step 3: Cross multiply
   1,404.74x = 1,938.60 × 931.79
4. Step 4: Simplify right side
   1,404.74x = 1,806,358.40
5. Step 5: Solve for x
   x = 1,806,358.40/1,404.74
6. Step 6: Final answer
   x = 1,285.91