Finding the Fourth Proportional to 2,129.72, 3,191.01 and 742.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,129.72 : 3,191.01 = 742.28 : x
2. Step 2: Convert to fraction form
   2,129.72/3,191.01 = 742.28/x
3. Step 3: Cross multiply
   2,129.72x = 3,191.01 × 742.28
4. Step 4: Simplify right side
   2,129.72x = 2,368,606.95
5. Step 5: Solve for x
   x = 2,368,606.95/2,129.72
6. Step 6: Final answer
   x = 1,112.17