Finding the Fourth Proportional to 55,172.48, 82,770.98 and 20,112.12

Step by Step Solution

1. Step 1: Write the proportion equation
   55,172.48 : 82,770.98 = 20,112.12 : x
2. Step 2: Convert to fraction form
   55,172.48/82,770.98 = 20,112.12/x
3. Step 3: Cross multiply
   55,172.48x = 82,770.98 × 20,112.12
4. Step 4: Simplify right side
   55,172.48x = 1,664,699,781.72
5. Step 5: Solve for x
   x = 1,664,699,781.72/55,172.48
6. Step 6: Final answer
   x = 30,172.65