Finding the Fourth Proportional to 200,426.96, 276,456.29 and 128,897.48

Step by Step Solution

1. Step 1: Write the proportion equation
   200,426.96 : 276,456.29 = 128,897.48 : x
2. Step 2: Convert to fraction form
   200,426.96/276,456.29 = 128,897.48/x
3. Step 3: Cross multiply
   200,426.96x = 276,456.29 × 128,897.48
4. Step 4: Simplify right side
   200,426.96x = 35,634,519,111.15
5. Step 5: Solve for x
   x = 35,634,519,111.15/200,426.96
6. Step 6: Final answer
   x = 177,793.04