Finding the Fourth Proportional to 120,499.53, 180,571.69 and 67,118.01

Step by Step Solution

1. Step 1: Write the proportion equation
   120,499.53 : 180,571.69 = 67,118.01 : x
2. Step 2: Convert to fraction form
   120,499.53/180,571.69 = 67,118.01/x
3. Step 3: Cross multiply
   120,499.53x = 180,571.69 × 67,118.01
4. Step 4: Simplify right side
   120,499.53x = 12,119,612,159.55
5. Step 5: Solve for x
   x = 12,119,612,159.55/120,499.53
6. Step 6: Final answer
   x = 100,578.09