Finding the Fourth Proportional to 91,499.94, 136,627.09 and 80,736.60

Step by Step Solution

1. Step 1: Write the proportion equation
   91,499.94 : 136,627.09 = 80,736.60 : x
2. Step 2: Convert to fraction form
   91,499.94/136,627.09 = 80,736.60/x
3. Step 3: Cross multiply
   91,499.94x = 136,627.09 × 80,736.60
4. Step 4: Simplify right side
   91,499.94x = 11,030,806,714.49
5. Step 5: Solve for x
   x = 11,030,806,714.49/91,499.94
6. Step 6: Final answer
   x = 120,555.34