Finding the Fourth Proportional to 322,443.76, 483,665 and 85,786.72

Step by Step Solution

1. Step 1: Write the proportion equation
   322,443.76 : 483,665 = 85,786.72 : x
2. Step 2: Convert to fraction form
   322,443.76/483,665 = 85,786.72/x
3. Step 3: Cross multiply
   322,443.76x = 483,665 × 85,786.72
4. Step 4: Simplify right side
   322,443.76x = 41,492,033,928.80
5. Step 5: Solve for x
   x = 41,492,033,928.80/322,443.76
6. Step 6: Final answer
   x = 128,679.91