Finding the Fourth Proportional to 1,191.39, 1,643.82 and 719.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.39 : 1,643.82 = 719.19 : x
2. Step 2: Convert to fraction form
   1,191.39/1,643.82 = 719.19/x
3. Step 3: Cross multiply
   1,191.39x = 1,643.82 × 719.19
4. Step 4: Simplify right side
   1,191.39x = 1,182,218.91
5. Step 5: Solve for x
   x = 1,182,218.91/1,191.39
6. Step 6: Final answer
   x = 992.30