Finding the Fourth Proportional to 2,099.07, 3,143.79 and 1,172.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.07 : 3,143.79 = 1,172.79 : x
2. Step 2: Convert to fraction form
   2,099.07/3,143.79 = 1,172.79/x
3. Step 3: Cross multiply
   2,099.07x = 3,143.79 × 1,172.79
4. Step 4: Simplify right side
   2,099.07x = 3,687,005.47
5. Step 5: Solve for x
   x = 3,687,005.47/2,099.07
6. Step 6: Final answer
   x = 1,756.49