Finding the Fourth Proportional to 221,598.72, 305,805.78 and 120,996.72

Step by Step Solution

1. Step 1: Write the proportion equation
   221,598.72 : 305,805.78 = 120,996.72 : x
2. Step 2: Convert to fraction form
   221,598.72/305,805.78 = 120,996.72/x
3. Step 3: Cross multiply
   221,598.72x = 305,805.78 × 120,996.72
4. Step 4: Simplify right side
   221,598.72x = 37,001,496,337.04
5. Step 5: Solve for x
   x = 37,001,496,337.04/221,598.72
6. Step 6: Final answer
   x = 166,975.23