Finding the Fourth Proportional to 120,978.54, 181,349.55 and 54,435.42

Step by Step Solution

1. Step 1: Write the proportion equation
   120,978.54 : 181,349.55 = 54,435.42 : x
2. Step 2: Convert to fraction form
   120,978.54/181,349.55 = 54,435.42/x
3. Step 3: Cross multiply
   120,978.54x = 181,349.55 × 54,435.42
4. Step 4: Simplify right side
   120,978.54x = 9,871,838,921.06
5. Step 5: Solve for x
   x = 9,871,838,921.06/120,978.54
6. Step 6: Final answer
   x = 81,599.92