Finding the Fourth Proportional to 1,443.21, 2,165.63 and 577.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.21 : 2,165.63 = 577.59 : x
2. Step 2: Convert to fraction form
   1,443.21/2,165.63 = 577.59/x
3. Step 3: Cross multiply
   1,443.21x = 2,165.63 × 577.59
4. Step 4: Simplify right side
   1,443.21x = 1,250,843.34
5. Step 5: Solve for x
   x = 1,250,843.34/1,443.21
6. Step 6: Final answer
   x = 866.71