Finding the Fourth Proportional to 1,191.42, 1,643.72 and 719.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.42 : 1,643.72 = 719.46 : x
2. Step 2: Convert to fraction form
   1,191.42/1,643.72 = 719.46/x
3. Step 3: Cross multiply
   1,191.42x = 1,643.72 × 719.46
4. Step 4: Simplify right side
   1,191.42x = 1,182,587.19
5. Step 5: Solve for x
   x = 1,182,587.19/1,191.42
6. Step 6: Final answer
   x = 992.59