Finding the Fourth Proportional to 200,560.88, 276,899.82 and 129,065.12

Step by Step Solution

1. Step 1: Write the proportion equation
   200,560.88 : 276,899.82 = 129,065.12 : x
2. Step 2: Convert to fraction form
   200,560.88/276,899.82 = 129,065.12/x
3. Step 3: Cross multiply
   200,560.88x = 276,899.82 × 129,065.12
4. Step 4: Simplify right side
   200,560.88x = 35,738,108,496.28
5. Step 5: Solve for x
   x = 35,738,108,496.28/200,560.88
6. Step 6: Final answer
   x = 178,190.82