Finding the Fourth Proportional to 91,530, 136,632.12 and 79,129.72

Step by Step Solution

1. Step 1: Write the proportion equation
   91,530 : 136,632.12 = 79,129.72 : x
2. Step 2: Convert to fraction form
   91,530/136,632.12 = 79,129.72/x
3. Step 3: Cross multiply
   91,530x = 136,632.12 × 79,129.72
4. Step 4: Simplify right side
   91,530x = 10,811,661,398.61
5. Step 5: Solve for x
   x = 10,811,661,398.61/91,530
6. Step 6: Final answer
   x = 118,121.51