Finding the Fourth Proportional to 123,443.20, 185,121.60 and 64,259.20

Step by Step Solution

1. Step 1: Write the proportion equation
   123,443.20 : 185,121.60 = 64,259.20 : x
2. Step 2: Convert to fraction form
   123,443.20/185,121.60 = 64,259.20/x
3. Step 3: Cross multiply
   123,443.20x = 185,121.60 × 64,259.20
4. Step 4: Simplify right side
   123,443.20x = 11,895,765,918.72
5. Step 5: Solve for x
   x = 11,895,765,918.72/123,443.20
6. Step 6: Final answer
   x = 96,366.31