Finding the Fourth Proportional to 120,562.88, 166,343.82 and 72,145.32

Step by Step Solution

1. Step 1: Write the proportion equation
   120,562.88 : 166,343.82 = 72,145.32 : x
2. Step 2: Convert to fraction form
   120,562.88/166,343.82 = 72,145.32/x
3. Step 3: Cross multiply
   120,562.88x = 166,343.82 × 72,145.32
4. Step 4: Simplify right side
   120,562.88x = 12,000,928,123.92
5. Step 5: Solve for x
   x = 12,000,928,123.92/120,562.88
6. Step 6: Final answer
   x = 99,540.82