Finding the Fourth Proportional to 200,405.73, 276,426.91 and 128,876.25

Step by Step Solution

1. Step 1: Write the proportion equation
   200,405.73 : 276,426.91 = 128,876.25 : x
2. Step 2: Convert to fraction form
   200,405.73/276,426.91 = 128,876.25/x
3. Step 3: Cross multiply
   200,405.73x = 276,426.91 × 128,876.25
4. Step 4: Simplify right side
   200,405.73x = 35,624,863,559.89
5. Step 5: Solve for x
   x = 35,624,863,559.89/200,405.73
6. Step 6: Final answer
   x = 177,763.70