Finding the Fourth Proportional to 142,109.22, 196,100.09 and 81,680.02

Step by Step Solution

1. Step 1: Write the proportion equation
   142,109.22 : 196,100.09 = 81,680.02 : x
2. Step 2: Convert to fraction form
   142,109.22/196,100.09 = 81,680.02/x
3. Step 3: Cross multiply
   142,109.22x = 196,100.09 × 81,680.02
4. Step 4: Simplify right side
   142,109.22x = 16,017,459,273.20
5. Step 5: Solve for x
   x = 16,017,459,273.20/142,109.22
6. Step 6: Final answer
   x = 112,712.32