Finding the Fourth Proportional to 117,145.72, 161,684.94 and 79,432.12

Step by Step Solution

1. Step 1: Write the proportion equation
   117,145.72 : 161,684.94 = 79,432.12 : x
2. Step 2: Convert to fraction form
   117,145.72/161,684.94 = 79,432.12/x
3. Step 3: Cross multiply
   117,145.72x = 161,684.94 × 79,432.12
4. Step 4: Simplify right side
   117,145.72x = 12,842,977,556.27
5. Step 5: Solve for x
   x = 12,842,977,556.27/117,145.72
6. Step 6: Final answer
   x = 109,632.49