Finding the Fourth Proportional to 101,019.69, 139,400.73 and 55,695.20

Step by Step Solution

1. Step 1: Write the proportion equation
   101,019.69 : 139,400.73 = 55,695.20 : x
2. Step 2: Convert to fraction form
   101,019.69/139,400.73 = 55,695.20/x
3. Step 3: Cross multiply
   101,019.69x = 139,400.73 × 55,695.20
4. Step 4: Simplify right side
   101,019.69x = 7,763,950,840.49
5. Step 5: Solve for x
   x = 7,763,950,840.49/101,019.69
6. Step 6: Final answer
   x = 76,855.82