Finding the Fourth Proportional to 86,610.72, 130,212.56 and 80,117.76

Step by Step Solution

1. Step 1: Write the proportion equation
   86,610.72 : 130,212.56 = 80,117.76 : x
2. Step 2: Convert to fraction form
   86,610.72/130,212.56 = 80,117.76/x
3. Step 3: Cross multiply
   86,610.72x = 130,212.56 × 80,117.76
4. Step 4: Simplify right side
   86,610.72x = 10,432,338,631.07
5. Step 5: Solve for x
   x = 10,432,338,631.07/86,610.72
6. Step 6: Final answer
   x = 120,450.89