Finding the Fourth Proportional to 120,528.34, 166,213.73 and 72,122.00

Step by Step Solution

1. Step 1: Write the proportion equation
   120,528.34 : 166,213.73 = 72,122.00 : x
2. Step 2: Convert to fraction form
   120,528.34/166,213.73 = 72,122.00/x
3. Step 3: Cross multiply
   120,528.34x = 166,213.73 × 72,122.00
4. Step 4: Simplify right side
   120,528.34x = 11,987,665,984.30
5. Step 5: Solve for x
   x = 11,987,665,984.30/120,528.34
6. Step 6: Final answer
   x = 99,459.32