Finding the Fourth Proportional to 2,068.42, 2,854.21 and 1,172.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,068.42 : 2,854.21 = 1,172.20 : x
2. Step 2: Convert to fraction form
   2,068.42/2,854.21 = 1,172.20/x
3. Step 3: Cross multiply
   2,068.42x = 2,854.21 × 1,172.20
4. Step 4: Simplify right side
   2,068.42x = 3,345,704.96
5. Step 5: Solve for x
   x = 3,345,704.96/2,068.42
6. Step 6: Final answer
   x = 1,617.52