Finding the Fourth Proportional to 200,086.80, 276,156.72 and 128,556.24

Step by Step Solution

1. Step 1: Write the proportion equation
   200,086.80 : 276,156.72 = 128,556.24 : x
2. Step 2: Convert to fraction form
   200,086.80/276,156.72 = 128,556.24/x
3. Step 3: Cross multiply
   200,086.80x = 276,156.72 × 128,556.24
4. Step 4: Simplify right side
   200,086.80x = 35,501,669,573.93
5. Step 5: Solve for x
   x = 35,501,669,573.93/200,086.80
6. Step 6: Final answer
   x = 177,431.34