Finding the Fourth Proportional to 2,011.32, 2,776.05 and 1,172.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,011.32 : 2,776.05 = 1,172.16 : x
2. Step 2: Convert to fraction form
   2,011.32/2,776.05 = 1,172.16/x
3. Step 3: Cross multiply
   2,011.32x = 2,776.05 × 1,172.16
4. Step 4: Simplify right side
   2,011.32x = 3,253,974.77
5. Step 5: Solve for x
   x = 3,253,974.77/2,011.32
6. Step 6: Final answer
   x = 1,617.83