Finding the Fourth Proportional to 931.77, 1,399.82 and 808.72

Step by Step Solution

1. Step 1: Write the proportion equation
   931.77 : 1,399.82 = 808.72 : x
2. Step 2: Convert to fraction form
   931.77/1,399.82 = 808.72/x
3. Step 3: Cross multiply
   931.77x = 1,399.82 × 808.72
4. Step 4: Simplify right side
   931.77x = 1,132,054.89
5. Step 5: Solve for x
   x = 1,132,054.89/931.77
6. Step 6: Final answer
   x = 1,214.95