Finding the Fourth Proportional to 117,144.72, 161,683.56 and 79,431.12

Step by Step Solution

1. Step 1: Write the proportion equation
   117,144.72 : 161,683.56 = 79,431.12 : x
2. Step 2: Convert to fraction form
   117,144.72/161,683.56 = 79,431.12/x
3. Step 3: Cross multiply
   117,144.72x = 161,683.56 × 79,431.12
4. Step 4: Simplify right side
   117,144.72x = 12,842,706,256.39
5. Step 5: Solve for x
   x = 12,842,706,256.39/117,144.72
6. Step 6: Final answer
   x = 109,631.11