Finding the Fourth Proportional to 128,815.98, 177,768.89 and 71,453.43

Step by Step Solution

1. Step 1: Write the proportion equation
   128,815.98 : 177,768.89 = 71,453.43 : x
2. Step 2: Convert to fraction form
   128,815.98/177,768.89 = 71,453.43/x
3. Step 3: Cross multiply
   128,815.98x = 177,768.89 × 71,453.43
4. Step 4: Simplify right side
   128,815.98x = 12,702,196,937.79
5. Step 5: Solve for x
   x = 12,702,196,937.79/128,815.98
6. Step 6: Final answer
   x = 98,607.31