Finding the Fourth Proportional to 128,940.42, 177,934.89 and 71,576.37

Step by Step Solution

1. Step 1: Write the proportion equation
   128,940.42 : 177,934.89 = 71,576.37 : x
2. Step 2: Convert to fraction form
   128,940.42/177,934.89 = 71,576.37/x
3. Step 3: Cross multiply
   128,940.42x = 177,934.89 × 71,576.37
4. Step 4: Simplify right side
   128,940.42x = 12,735,933,522.55
5. Step 5: Solve for x
   x = 12,735,933,522.55/128,940.42
6. Step 6: Final answer
   x = 98,773.79