Finding the Fourth Proportional to 100,987.52, 139,362.09 and 55,665.55

Step by Step Solution

1. Step 1: Write the proportion equation
   100,987.52 : 139,362.09 = 55,665.55 : x
2. Step 2: Convert to fraction form
   100,987.52/139,362.09 = 55,665.55/x
3. Step 3: Cross multiply
   100,987.52x = 139,362.09 × 55,665.55
4. Step 4: Simplify right side
   100,987.52x = 7,757,667,040.59
5. Step 5: Solve for x
   x = 7,757,667,040.59/100,987.52
6. Step 6: Final answer
   x = 76,818.07