Finding the Fourth Proportional to 142,299, 196,374.54 and 78,638.28

Step by Step Solution

1. Step 1: Write the proportion equation
   142,299 : 196,374.54 = 78,638.28 : x
2. Step 2: Convert to fraction form
   142,299/196,374.54 = 78,638.28/x
3. Step 3: Cross multiply
   142,299x = 196,374.54 × 78,638.28
4. Step 4: Simplify right side
   142,299x = 15,442,556,061.39
5. Step 5: Solve for x
   x = 15,442,556,061.39/142,299
6. Step 6: Final answer
   x = 108,521.89