Finding the Fourth Proportional to 91,291.02, 136,969.34 and 80,334.15

Step by Step Solution

1. Step 1: Write the proportion equation
   91,291.02 : 136,969.34 = 80,334.15 : x
2. Step 2: Convert to fraction form
   91,291.02/136,969.34 = 80,334.15/x
3. Step 3: Cross multiply
   91,291.02x = 136,969.34 × 80,334.15
4. Step 4: Simplify right side
   91,291.02x = 11,003,315,504.96
5. Step 5: Solve for x
   x = 11,003,315,504.96/91,291.02
6. Step 6: Final answer
   x = 120,530.10