Finding the Fourth Proportional to 1,039.60, 1,433.98 and 818.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.60 : 1,433.98 = 818.46 : x
2. Step 2: Convert to fraction form
   1,039.60/1,433.98 = 818.46/x
3. Step 3: Cross multiply
   1,039.60x = 1,433.98 × 818.46
4. Step 4: Simplify right side
   1,039.60x = 1,173,655.27
5. Step 5: Solve for x
   x = 1,173,655.27/1,039.60
6. Step 6: Final answer
   x = 1,128.95