Finding the Fourth Proportional to 1,191.02, 1,643.46 and 718.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.02 : 1,643.46 = 718.76 : x
2. Step 2: Convert to fraction form
   1,191.02/1,643.46 = 718.76/x
3. Step 3: Cross multiply
   1,191.02x = 1,643.46 × 718.76
4. Step 4: Simplify right side
   1,191.02x = 1,181,253.31
5. Step 5: Solve for x
   x = 1,181,253.31/1,191.02
6. Step 6: Final answer
   x = 991.80