Finding the Fourth Proportional to 101,039.45, 139,431.24 and 55,719.35

Step by Step Solution

1. Step 1: Write the proportion equation
   101,039.45 : 139,431.24 = 55,719.35 : x
2. Step 2: Convert to fraction form
   101,039.45/139,431.24 = 55,719.35/x
3. Step 3: Cross multiply
   101,039.45x = 139,431.24 × 55,719.35
4. Step 4: Simplify right side
   101,039.45x = 7,769,017,365.34
5. Step 5: Solve for x
   x = 7,769,017,365.34/101,039.45
6. Step 6: Final answer
   x = 76,890.93