Finding the Fourth Proportional to 80,291.18, 120,321.30 and 45,156.62

Step by Step Solution

1. Step 1: Write the proportion equation
   80,291.18 : 120,321.30 = 45,156.62 : x
2. Step 2: Convert to fraction form
   80,291.18/120,321.30 = 45,156.62/x
3. Step 3: Cross multiply
   80,291.18x = 120,321.30 × 45,156.62
4. Step 4: Simplify right side
   80,291.18x = 5,433,303,222.01
5. Step 5: Solve for x
   x = 5,433,303,222.01/80,291.18
6. Step 6: Final answer
   x = 67,669.99