Finding the Fourth Proportional to 100,727.69, 139,007.61 and 55,407.38

Step by Step Solution

1. Step 1: Write the proportion equation
   100,727.69 : 139,007.61 = 55,407.38 : x
2. Step 2: Convert to fraction form
   100,727.69/139,007.61 = 55,407.38/x
3. Step 3: Cross multiply
   100,727.69x = 139,007.61 × 55,407.38
4. Step 4: Simplify right side
   100,727.69x = 7,702,046,775.12
5. Step 5: Solve for x
   x = 7,702,046,775.12/100,727.69
6. Step 6: Final answer
   x = 76,464.05