Finding the Fourth Proportional to 85,443.20, 128,178.12 and 41,061.68

Step by Step Solution

1. Step 1: Write the proportion equation
   85,443.20 : 128,178.12 = 41,061.68 : x
2. Step 2: Convert to fraction form
   85,443.20/128,178.12 = 41,061.68/x
3. Step 3: Cross multiply
   85,443.20x = 128,178.12 × 41,061.68
4. Step 4: Simplify right side
   85,443.20x = 5,263,208,946.44
5. Step 5: Solve for x
   x = 5,263,208,946.44/85,443.20
6. Step 6: Final answer
   x = 61,598.92