Finding the Fourth Proportional to 100,804.72, 139,105.48 and 55,481.55

Step by Step Solution

1. Step 1: Write the proportion equation
   100,804.72 : 139,105.48 = 55,481.55 : x
2. Step 2: Convert to fraction form
   100,804.72/139,105.48 = 55,481.55/x
3. Step 3: Cross multiply
   100,804.72x = 139,105.48 × 55,481.55
4. Step 4: Simplify right side
   100,804.72x = 7,717,787,643.89
5. Step 5: Solve for x
   x = 7,717,787,643.89/100,804.72
6. Step 6: Final answer
   x = 76,561.77