Finding the Fourth Proportional to 1,317.96, 1,818.86 and 820.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,317.96 : 1,818.86 = 820.62 : x
2. Step 2: Convert to fraction form
   1,317.96/1,818.86 = 820.62/x
3. Step 3: Cross multiply
   1,317.96x = 1,818.86 × 820.62
4. Step 4: Simplify right side
   1,317.96x = 1,492,588.79
5. Step 5: Solve for x
   x = 1,492,588.79/1,317.96
6. Step 6: Final answer
   x = 1,132.50