Finding the Fourth Proportional to 1,091.47, 1,506.72 and 718.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.47 : 1,506.72 = 718.65 : x
2. Step 2: Convert to fraction form
   1,091.47/1,506.72 = 718.65/x
3. Step 3: Cross multiply
   1,091.47x = 1,506.72 × 718.65
4. Step 4: Simplify right side
   1,091.47x = 1,082,796.79
5. Step 5: Solve for x
   x = 1,082,796.79/1,091.47
6. Step 6: Final answer
   x = 992.05