Finding the Fourth Proportional to 143,843.52, 215,809.92 and 128,958.72

Step by Step Solution

1. Step 1: Write the proportion equation
   143,843.52 : 215,809.92 = 128,958.72 : x
2. Step 2: Convert to fraction form
   143,843.52/215,809.92 = 128,958.72/x
3. Step 3: Cross multiply
   143,843.52x = 215,809.92 × 128,958.72
4. Step 4: Simplify right side
   143,843.52x = 27,830,571,046.50
5. Step 5: Solve for x
   x = 27,830,571,046.50/143,843.52
6. Step 6: Final answer
   x = 193,478.10