Finding the Fourth Proportional to 860.79, 1,187.82 and 506.72

Step by Step Solution

1. Step 1: Write the proportion equation
   860.79 : 1,187.82 = 506.72 : x
2. Step 2: Convert to fraction form
   860.79/1,187.82 = 506.72/x
3. Step 3: Cross multiply
   860.79x = 1,187.82 × 506.72
4. Step 4: Simplify right side
   860.79x = 601,892.15
5. Step 5: Solve for x
   x = 601,892.15/860.79
6. Step 6: Final answer
   x = 699.23