Finding the Fourth Proportional to 120,046.53, 180,019.98 and 45,128.01

Step by Step Solution

1. Step 1: Write the proportion equation
   120,046.53 : 180,019.98 = 45,128.01 : x
2. Step 2: Convert to fraction form
   120,046.53/180,019.98 = 45,128.01/x
3. Step 3: Cross multiply
   120,046.53x = 180,019.98 × 45,128.01
4. Step 4: Simplify right side
   120,046.53x = 8,123,943,457.64
5. Step 5: Solve for x
   x = 8,123,943,457.64/120,046.53
6. Step 6: Final answer
   x = 67,673.29