Finding the Fourth Proportional to 221,844.78, 306,145.89 and 121,242.78

Step by Step Solution

1. Step 1: Write the proportion equation
   221,844.78 : 306,145.89 = 121,242.78 : x
2. Step 2: Convert to fraction form
   221,844.78/306,145.89 = 121,242.78/x
3. Step 3: Cross multiply
   221,844.78x = 306,145.89 × 121,242.78
4. Step 4: Simplify right side
   221,844.78x = 37,117,978,789.17
5. Step 5: Solve for x
   x = 37,117,978,789.17/221,844.78
6. Step 6: Final answer
   x = 167,315.09