Finding the Fourth Proportional to 120,399.42, 166,157.16 and 72,651.96

Step by Step Solution

1. Step 1: Write the proportion equation
   120,399.42 : 166,157.16 = 72,651.96 : x
2. Step 2: Convert to fraction form
   120,399.42/166,157.16 = 72,651.96/x
3. Step 3: Cross multiply
   120,399.42x = 166,157.16 × 72,651.96
4. Step 4: Simplify right side
   120,399.42x = 12,071,643,342.03
5. Step 5: Solve for x
   x = 12,071,643,342.03/120,399.42
6. Step 6: Final answer
   x = 100,263.30