Finding the Fourth Proportional to 8,123.60, 10,975.50 and 8,123.60

Step by Step Solution

1. Step 1: Write the proportion equation
   8,123.60 : 10,975.50 = 8,123.60 : x
2. Step 2: Convert to fraction form
   8,123.60/10,975.50 = 8,123.60/x
3. Step 3: Cross multiply
   8,123.60x = 10,975.50 × 8,123.60
4. Step 4: Simplify right side
   8,123.60x = 89,160,571.80
5. Step 5: Solve for x
   x = 89,160,571.80/8,123.60
6. Step 6: Final answer
   x = 10,975.50