Finding the Fourth Proportional to 100,727.79, 139,002.05 and 55,404.79

Step by Step Solution

1. Step 1: Write the proportion equation
   100,727.79 : 139,002.05 = 55,404.79 : x
2. Step 2: Convert to fraction form
   100,727.79/139,002.05 = 55,404.79/x
3. Step 3: Cross multiply
   100,727.79x = 139,002.05 × 55,404.79
4. Step 4: Simplify right side
   100,727.79x = 7,701,379,180.83
5. Step 5: Solve for x
   x = 7,701,379,180.83/100,727.79
6. Step 6: Final answer
   x = 76,457.35