Finding the Fourth Proportional to 101,128.94, 139,560.77 and 55,809.78

Step by Step Solution

1. Step 1: Write the proportion equation
   101,128.94 : 139,560.77 = 55,809.78 : x
2. Step 2: Convert to fraction form
   101,128.94/139,560.77 = 55,809.78/x
3. Step 3: Cross multiply
   101,128.94x = 139,560.77 × 55,809.78
4. Step 4: Simplify right side
   101,128.94x = 7,788,856,009.86
5. Step 5: Solve for x
   x = 7,788,856,009.86/101,128.94
6. Step 6: Final answer
   x = 77,019.06