Finding the Fourth Proportional to 108,111.80, 162,021.90 and 72,471.80

Step by Step Solution

1. Step 1: Write the proportion equation
   108,111.80 : 162,021.90 = 72,471.80 : x
2. Step 2: Convert to fraction form
   108,111.80/162,021.90 = 72,471.80/x
3. Step 3: Cross multiply
   108,111.80x = 162,021.90 × 72,471.80
4. Step 4: Simplify right side
   108,111.80x = 11,742,018,732.42
5. Step 5: Solve for x
   x = 11,742,018,732.42/108,111.80
6. Step 6: Final answer
   x = 108,609.96