Finding the Fourth Proportional to 200,387.01, 276,721.41 and 128,891.15

Step by Step Solution

1. Step 1: Write the proportion equation
   200,387.01 : 276,721.41 = 128,891.15 : x
2. Step 2: Convert to fraction form
   200,387.01/276,721.41 = 128,891.15/x
3. Step 3: Cross multiply
   200,387.01x = 276,721.41 × 128,891.15
4. Step 4: Simplify right side
   200,387.01x = 35,666,940,764.52
5. Step 5: Solve for x
   x = 35,666,940,764.52/200,387.01
6. Step 6: Final answer
   x = 177,990.28