Finding the Fourth Proportional to 100,989, 139,364.07 and 55,667.03

Step by Step Solution

1. Step 1: Write the proportion equation
   100,989 : 139,364.07 = 55,667.03 : x
2. Step 2: Convert to fraction form
   100,989/139,364.07 = 55,667.03/x
3. Step 3: Cross multiply
   100,989x = 139,364.07 × 55,667.03
4. Step 4: Simplify right side
   100,989x = 7,757,983,168.79
5. Step 5: Solve for x
   x = 7,757,983,168.79/100,989
6. Step 6: Final answer
   x = 76,820.08