Finding the Fourth Proportional to 100,986.72, 139,356.72 and 55,667.22

Step by Step Solution

1. Step 1: Write the proportion equation
   100,986.72 : 139,356.72 = 55,667.22 : x
2. Step 2: Convert to fraction form
   100,986.72/139,356.72 = 55,667.22/x
3. Step 3: Cross multiply
   100,986.72x = 139,356.72 × 55,667.22
4. Step 4: Simplify right side
   100,986.72x = 7,757,601,190.72
5. Step 5: Solve for x
   x = 7,757,601,190.72/100,986.72
6. Step 6: Final answer
   x = 76,818.03