Finding the Fourth Proportional to 120,561.22, 166,347.60 and 72,155.62

Step by Step Solution

1. Step 1: Write the proportion equation
   120,561.22 : 166,347.60 = 72,155.62 : x
2. Step 2: Convert to fraction form
   120,561.22/166,347.60 = 72,155.62/x
3. Step 3: Cross multiply
   120,561.22x = 166,347.60 × 72,155.62
4. Step 4: Simplify right side
   120,561.22x = 12,002,914,213.51
5. Step 5: Solve for x
   x = 12,002,914,213.51/120,561.22
6. Step 6: Final answer
   x = 99,558.67