Finding the Fourth Proportional to 122,839.20, 169,610.47 and 120,877.42

Step by Step Solution

1. Step 1: Write the proportion equation
   122,839.20 : 169,610.47 = 120,877.42 : x
2. Step 2: Convert to fraction form
   122,839.20/169,610.47 = 120,877.42/x
3. Step 3: Cross multiply
   122,839.20x = 169,610.47 × 120,877.42
4. Step 4: Simplify right side
   122,839.20x = 20,502,076,018.59
5. Step 5: Solve for x
   x = 20,502,076,018.59/122,839.20
6. Step 6: Final answer
   x = 166,901.75