Finding the Fourth Proportional to 2,443.21, 3,663.42 and 777.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,443.21 : 3,663.42 = 777.02 : x
2. Step 2: Convert to fraction form
   2,443.21/3,663.42 = 777.02/x
3. Step 3: Cross multiply
   2,443.21x = 3,663.42 × 777.02
4. Step 4: Simplify right side
   2,443.21x = 2,846,550.61
5. Step 5: Solve for x
   x = 2,846,550.61/2,443.21
6. Step 6: Final answer
   x = 1,165.09