Finding the Fourth Proportional to 2,111.28, 2,913.66 and 1,179.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.28 : 2,913.66 = 1,179.72 : x
2. Step 2: Convert to fraction form
   2,111.28/2,913.66 = 1,179.72/x
3. Step 3: Cross multiply
   2,111.28x = 2,913.66 × 1,179.72
4. Step 4: Simplify right side
   2,111.28x = 3,437,302.98
5. Step 5: Solve for x
   x = 3,437,302.98/2,111.28
6. Step 6: Final answer
   x = 1,628.07