Finding the Fourth Proportional to 128,619, 177,494.27 and 72,030.38

Step by Step Solution

1. Step 1: Write the proportion equation
   128,619 : 177,494.27 = 72,030.38 : x
2. Step 2: Convert to fraction form
   128,619/177,494.27 = 72,030.38/x
3. Step 3: Cross multiply
   128,619x = 177,494.27 × 72,030.38
4. Step 4: Simplify right side
   128,619x = 12,784,978,468.30
5. Step 5: Solve for x
   x = 12,784,978,468.30/128,619
6. Step 6: Final answer
   x = 99,401.94