Finding the Fourth Proportional to 141,996.80, 196,018.56 and 91,720.32

Step by Step Solution

1. Step 1: Write the proportion equation
   141,996.80 : 196,018.56 = 91,720.32 : x
2. Step 2: Convert to fraction form
   141,996.80/196,018.56 = 91,720.32/x
3. Step 3: Cross multiply
   141,996.80x = 196,018.56 × 91,720.32
4. Step 4: Simplify right side
   141,996.80x = 17,978,885,049.14
5. Step 5: Solve for x
   x = 17,978,885,049.14/141,996.80
6. Step 6: Final answer
   x = 126,614.72