Finding the Fourth Proportional to 2,720.47, 4,081.38 and 772.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,720.47 : 4,081.38 = 772.69 : x
2. Step 2: Convert to fraction form
   2,720.47/4,081.38 = 772.69/x
3. Step 3: Cross multiply
   2,720.47x = 4,081.38 × 772.69
4. Step 4: Simplify right side
   2,720.47x = 3,153,641.51
5. Step 5: Solve for x
   x = 3,153,641.51/2,720.47
6. Step 6: Final answer
   x = 1,159.23