Finding the Fourth Proportional to 100,620.36, 138,849.37 and 55,297.37

Step by Step Solution

1. Step 1: Write the proportion equation
   100,620.36 : 138,849.37 = 55,297.37 : x
2. Step 2: Convert to fraction form
   100,620.36/138,849.37 = 55,297.37/x
3. Step 3: Cross multiply
   100,620.36x = 138,849.37 × 55,297.37
4. Step 4: Simplify right side
   100,620.36x = 7,678,004,016.42
5. Step 5: Solve for x
   x = 7,678,004,016.42/100,620.36
6. Step 6: Final answer
   x = 76,306.66