Finding the Fourth Proportional to 2,011.42, 2,775.54 and 1,172.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,011.42 : 2,775.54 = 1,172.14 : x
2. Step 2: Convert to fraction form
   2,011.42/2,775.54 = 1,172.14/x
3. Step 3: Cross multiply
   2,011.42x = 2,775.54 × 1,172.14
4. Step 4: Simplify right side
   2,011.42x = 3,253,321.46
5. Step 5: Solve for x
   x = 3,253,321.46/2,011.42
6. Step 6: Final answer
   x = 1,617.43