Finding the Fourth Proportional to 196,530.54, 271,128.11 and 128,429.31

Step by Step Solution

1. Step 1: Write the proportion equation
   196,530.54 : 271,128.11 = 128,429.31 : x
2. Step 2: Convert to fraction form
   196,530.54/271,128.11 = 128,429.31/x
3. Step 3: Cross multiply
   196,530.54x = 271,128.11 × 128,429.31
4. Step 4: Simplify right side
   196,530.54x = 34,820,795,446.76
5. Step 5: Solve for x
   x = 34,820,795,446.76/196,530.54
6. Step 6: Final answer
   x = 177,177.53