Finding the Fourth Proportional to 200,388.01, 276,722.79 and 128,892.15

Step by Step Solution

1. Step 1: Write the proportion equation
   200,388.01 : 276,722.79 = 128,892.15 : x
2. Step 2: Convert to fraction form
   200,388.01/276,722.79 = 128,892.15/x
3. Step 3: Cross multiply
   200,388.01x = 276,722.79 × 128,892.15
4. Step 4: Simplify right side
   200,388.01x = 35,667,395,357.10
5. Step 5: Solve for x
   x = 35,667,395,357.10/200,388.01
6. Step 6: Final answer
   x = 177,991.66