Finding the Fourth Proportional to 1,091.91, 1,506.72 and 719.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.91 : 1,506.72 = 719.61 : x
2. Step 2: Convert to fraction form
   1,091.91/1,506.72 = 719.61/x
3. Step 3: Cross multiply
   1,091.91x = 1,506.72 × 719.61
4. Step 4: Simplify right side
   1,091.91x = 1,084,250.78
5. Step 5: Solve for x
   x = 1,084,250.78/1,091.91
6. Step 6: Final answer
   x = 992.99