Finding the Fourth Proportional to 128,825.37, 177,789.33 and 71,470.35

Step by Step Solution

1. Step 1: Write the proportion equation
   128,825.37 : 177,789.33 = 71,470.35 : x
2. Step 2: Convert to fraction form
   128,825.37/177,789.33 = 71,470.35/x
3. Step 3: Cross multiply
   128,825.37x = 177,789.33 × 71,470.35
4. Step 4: Simplify right side
   128,825.37x = 12,706,665,641.37
5. Step 5: Solve for x
   x = 12,706,665,641.37/128,825.37
6. Step 6: Final answer
   x = 98,634.81