Finding the Fourth Proportional to 101,296.92, 139,789.22 and 55,978.05

Step by Step Solution

1. Step 1: Write the proportion equation
   101,296.92 : 139,789.22 = 55,978.05 : x
2. Step 2: Convert to fraction form
   101,296.92/139,789.22 = 55,978.05/x
3. Step 3: Cross multiply
   101,296.92x = 139,789.22 × 55,978.05
4. Step 4: Simplify right side
   101,296.92x = 7,825,127,666.73
5. Step 5: Solve for x
   x = 7,825,127,666.73/101,296.92
6. Step 6: Final answer
   x = 77,249.41