Finding the Fourth Proportional to 143,978.20, 198,688.56 and 79,448.02

Step by Step Solution

1. Step 1: Write the proportion equation
   143,978.20 : 198,688.56 = 79,448.02 : x
2. Step 2: Convert to fraction form
   143,978.20/198,688.56 = 79,448.02/x
3. Step 3: Cross multiply
   143,978.20x = 198,688.56 × 79,448.02
4. Step 4: Simplify right side
   143,978.20x = 15,785,412,688.65
5. Step 5: Solve for x
   x = 15,785,412,688.65/143,978.20
6. Step 6: Final answer
   x = 109,637.52