Finding the Fourth Proportional to 1,191.42, 1,643.81 and 818.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.42 : 1,643.81 = 818.82 : x
2. Step 2: Convert to fraction form
   1,191.42/1,643.81 = 818.82/x
3. Step 3: Cross multiply
   1,191.42x = 1,643.81 × 818.82
4. Step 4: Simplify right side
   1,191.42x = 1,345,980.41
5. Step 5: Solve for x
   x = 1,345,980.41/1,191.42
6. Step 6: Final answer
   x = 1,129.73