Finding the Fourth Proportional to 128,016.21, 176,658.70 and 71,426.37

Step by Step Solution

1. Step 1: Write the proportion equation
   128,016.21 : 176,658.70 = 71,426.37 : x
2. Step 2: Convert to fraction form
   128,016.21/176,658.70 = 71,426.37/x
3. Step 3: Cross multiply
   128,016.21x = 176,658.70 × 71,426.37
4. Step 4: Simplify right side
   128,016.21x = 12,618,089,669.92
5. Step 5: Solve for x
   x = 12,618,089,669.92/128,016.21
6. Step 6: Final answer
   x = 98,566.34