Finding the Fourth Proportional to 120,529.34, 166,215.11 and 72,123

Step by Step Solution

1. Step 1: Write the proportion equation
   120,529.34 : 166,215.11 = 72,123 : x
2. Step 2: Convert to fraction form
   120,529.34/166,215.11 = 72,123/x
3. Step 3: Cross multiply
   120,529.34x = 166,215.11 × 72,123
4. Step 4: Simplify right side
   120,529.34x = 11,987,932,378.53
5. Step 5: Solve for x
   x = 11,987,932,378.53/120,529.34
6. Step 6: Final answer
   x = 99,460.70