Finding the Fourth Proportional to 120,109.20, 180,012.60 and 60,961.20

Step by Step Solution

1. Step 1: Write the proportion equation
   120,109.20 : 180,012.60 = 60,961.20 : x
2. Step 2: Convert to fraction form
   120,109.20/180,012.60 = 60,961.20/x
3. Step 3: Cross multiply
   120,109.20x = 180,012.60 × 60,961.20
4. Step 4: Simplify right side
   120,109.20x = 10,973,784,111.12
5. Step 5: Solve for x
   x = 10,973,784,111.12/120,109.20
6. Step 6: Final answer
   x = 91,365.06