Finding the Fourth Proportional to 120,622.71, 166,455.39 and 72,867.72

Step by Step Solution

1. Step 1: Write the proportion equation
   120,622.71 : 166,455.39 = 72,867.72 : x
2. Step 2: Convert to fraction form
   120,622.71/166,455.39 = 72,867.72/x
3. Step 3: Cross multiply
   120,622.71x = 166,455.39 × 72,867.72
4. Step 4: Simplify right side
   120,622.71x = 12,129,224,751.01
5. Step 5: Solve for x
   x = 12,129,224,751.01/120,622.71
6. Step 6: Final answer
   x = 100,555.07