Finding the Fourth Proportional to 931.59, 1,399.23 and 802.71

Step by Step Solution

1. Step 1: Write the proportion equation
   931.59 : 1,399.23 = 802.71 : x
2. Step 2: Convert to fraction form
   931.59/1,399.23 = 802.71/x
3. Step 3: Cross multiply
   931.59x = 1,399.23 × 802.71
4. Step 4: Simplify right side
   931.59x = 1,123,175.91
5. Step 5: Solve for x
   x = 1,123,175.91/931.59
6. Step 6: Final answer
   x = 1,205.65