Finding the Fourth Proportional to 196,521.72, 271,198.62 and 111,638.78

Step by Step Solution

1. Step 1: Write the proportion equation
   196,521.72 : 271,198.62 = 111,638.78 : x
2. Step 2: Convert to fraction form
   196,521.72/271,198.62 = 111,638.78/x
3. Step 3: Cross multiply
   196,521.72x = 271,198.62 × 111,638.78
4. Step 4: Simplify right side
   196,521.72x = 30,276,283,074.48
5. Step 5: Solve for x
   x = 30,276,283,074.48/196,521.72
6. Step 6: Final answer
   x = 154,060.75