Finding the Fourth Proportional to 142,291.22, 196,374.30 and 78,641.31

Step by Step Solution

1. Step 1: Write the proportion equation
   142,291.22 : 196,374.30 = 78,641.31 : x
2. Step 2: Convert to fraction form
   142,291.22/196,374.30 = 78,641.31/x
3. Step 3: Cross multiply
   142,291.22x = 196,374.30 × 78,641.31
4. Step 4: Simplify right side
   142,291.22x = 15,443,132,202.33
5. Step 5: Solve for x
   x = 15,443,132,202.33/142,291.22
6. Step 6: Final answer
   x = 108,531.87