Finding the Fourth Proportional to 120,728.16, 181,096.05 and 57,555.18

Step by Step Solution

1. Step 1: Write the proportion equation
   120,728.16 : 181,096.05 = 57,555.18 : x
2. Step 2: Convert to fraction form
   120,728.16/181,096.05 = 57,555.18/x
3. Step 3: Cross multiply
   120,728.16x = 181,096.05 × 57,555.18
4. Step 4: Simplify right side
   120,728.16x = 10,423,015,755.04
5. Step 5: Solve for x
   x = 10,423,015,755.04/120,728.16
6. Step 6: Final answer
   x = 86,334.59