Finding the Fourth Proportional to 104,064.80, 156,096.98 and 80,406.72

Step by Step Solution

1. Step 1: Write the proportion equation
   104,064.80 : 156,096.98 = 80,406.72 : x
2. Step 2: Convert to fraction form
   104,064.80/156,096.98 = 80,406.72/x
3. Step 3: Cross multiply
   104,064.80x = 156,096.98 × 80,406.72
4. Step 4: Simplify right side
   104,064.80x = 12,551,245,761.67
5. Step 5: Solve for x
   x = 12,551,245,761.67/104,064.80
6. Step 6: Final answer
   x = 120,609.91