Finding the Fourth Proportional to 142,748.02, 196,993.92 and 78,219.10

Step by Step Solution

1. Step 1: Write the proportion equation
   142,748.02 : 196,993.92 = 78,219.10 : x
2. Step 2: Convert to fraction form
   142,748.02/196,993.92 = 78,219.10/x
3. Step 3: Cross multiply
   142,748.02x = 196,993.92 × 78,219.10
4. Step 4: Simplify right side
   142,748.02x = 15,408,687,127.87
5. Step 5: Solve for x
   x = 15,408,687,127.87/142,748.02
6. Step 6: Final answer
   x = 107,943.26