Finding the Fourth Proportional to 1,911.91, 2,868.69 and 742.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,911.91 : 2,868.69 = 742.72 : x
2. Step 2: Convert to fraction form
   1,911.91/2,868.69 = 742.72/x
3. Step 3: Cross multiply
   1,911.91x = 2,868.69 × 742.72
4. Step 4: Simplify right side
   1,911.91x = 2,130,633.44
5. Step 5: Solve for x
   x = 2,130,633.44/1,911.91
6. Step 6: Final answer
   x = 1,114.40