Finding the Fourth Proportional to 1,190.86, 1,643.82 and 718.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,190.86 : 1,643.82 = 718.78 : x
2. Step 2: Convert to fraction form
   1,190.86/1,643.82 = 718.78/x
3. Step 3: Cross multiply
   1,190.86x = 1,643.82 × 718.78
4. Step 4: Simplify right side
   1,190.86x = 1,181,544.94
5. Step 5: Solve for x
   x = 1,181,544.94/1,190.86
6. Step 6: Final answer
   x = 992.18