Finding the Fourth Proportional to 120,139.72, 165,797.52 and 79,783.90

Step by Step Solution

1. Step 1: Write the proportion equation
   120,139.72 : 165,797.52 = 79,783.90 : x
2. Step 2: Convert to fraction form
   120,139.72/165,797.52 = 79,783.90/x
3. Step 3: Cross multiply
   120,139.72x = 165,797.52 × 79,783.90
4. Step 4: Simplify right side
   120,139.72x = 13,227,972,755.93
5. Step 5: Solve for x
   x = 13,227,972,755.93/120,139.72
6. Step 6: Final answer
   x = 110,104.91