Finding the Fourth Proportional to 101,039.74, 139,442.79 and 55,721.86

Step by Step Solution

1. Step 1: Write the proportion equation
   101,039.74 : 139,442.79 = 55,721.86 : x
2. Step 2: Convert to fraction form
   101,039.74/139,442.79 = 55,721.86/x
3. Step 3: Cross multiply
   101,039.74x = 139,442.79 × 55,721.86
4. Step 4: Simplify right side
   101,039.74x = 7,770,011,622.39
5. Step 5: Solve for x
   x = 7,770,011,622.39/101,039.74
6. Step 6: Final answer
   x = 76,900.55