Finding the Fourth Proportional to 1,820.47, 2,728.43 and 779.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,820.47 : 2,728.43 = 779.25 : x
2. Step 2: Convert to fraction form
   1,820.47/2,728.43 = 779.25/x
3. Step 3: Cross multiply
   1,820.47x = 2,728.43 × 779.25
4. Step 4: Simplify right side
   1,820.47x = 2,126,111.54
5. Step 5: Solve for x
   x = 2,126,111.54/1,820.47
6. Step 6: Final answer
   x = 1,167.89