Finding the Fourth Proportional to 142,173, 196,197.99 and 78,510.78

Step by Step Solution

1. Step 1: Write the proportion equation
   142,173 : 196,197.99 = 78,510.78 : x
2. Step 2: Convert to fraction form
   142,173/196,197.99 = 78,510.78/x
3. Step 3: Cross multiply
   142,173x = 196,197.99 × 78,510.78
4. Step 4: Simplify right side
   142,173x = 15,403,657,229.33
5. Step 5: Solve for x
   x = 15,403,657,229.33/142,173
6. Step 6: Final answer
   x = 108,344.46