Finding the Fourth Proportional to 141,969.72, 213,933.90 and 128,642.10

Step by Step Solution

1. Step 1: Write the proportion equation
   141,969.72 : 213,933.90 = 128,642.10 : x
2. Step 2: Convert to fraction form
   141,969.72/213,933.90 = 128,642.10/x
3. Step 3: Cross multiply
   141,969.72x = 213,933.90 × 128,642.10
4. Step 4: Simplify right side
   141,969.72x = 27,520,906,157.19
5. Step 5: Solve for x
   x = 27,520,906,157.19/141,969.72
6. Step 6: Final answer
   x = 193,850.53