Finding the Fourth Proportional to 200,429.46, 276,459.75 and 128,899.98

Step by Step Solution

1. Step 1: Write the proportion equation
   200,429.46 : 276,459.75 = 128,899.98 : x
2. Step 2: Convert to fraction form
   200,429.46/276,459.75 = 128,899.98/x
3. Step 3: Cross multiply
   200,429.46x = 276,459.75 × 128,899.98
4. Step 4: Simplify right side
   200,429.46x = 35,635,656,245.81
5. Step 5: Solve for x
   x = 35,635,656,245.81/200,429.46
6. Step 6: Final answer
   x = 177,796.50