Finding the Fourth Proportional to 142,348, 196,438.80 and 78,682.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,348 : 196,438.80 = 78,682.72 : x
2. Step 2: Convert to fraction form
   142,348/196,438.80 = 78,682.72/x
3. Step 3: Cross multiply
   142,348x = 196,438.80 × 78,682.72
4. Step 4: Simplify right side
   142,348x = 15,456,339,097.54
5. Step 5: Solve for x
   x = 15,456,339,097.54/142,348
6. Step 6: Final answer
   x = 108,581.36