Finding the Fourth Proportional to 128,381.39, 177,163 and 71,019.22

Step by Step Solution

1. Step 1: Write the proportion equation
   128,381.39 : 177,163 = 71,019.22 : x
2. Step 2: Convert to fraction form
   128,381.39/177,163 = 71,019.22/x
3. Step 3: Cross multiply
   128,381.39x = 177,163 × 71,019.22
4. Step 4: Simplify right side
   128,381.39x = 12,581,978,072.86
5. Step 5: Solve for x
   x = 12,581,978,072.86/128,381.39
6. Step 6: Final answer
   x = 98,004.69