Finding the Fourth Proportional to 2,386.72, 3,580.51 and 742.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,386.72 : 3,580.51 = 742.88 : x
2. Step 2: Convert to fraction form
   2,386.72/3,580.51 = 742.88/x
3. Step 3: Cross multiply
   2,386.72x = 3,580.51 × 742.88
4. Step 4: Simplify right side
   2,386.72x = 2,659,889.27
5. Step 5: Solve for x
   x = 2,659,889.27/2,386.72
6. Step 6: Final answer
   x = 1,114.45