Finding the Fourth Proportional to 82,123.60, 123,012.60 and 68,299.60

Step by Step Solution

1. Step 1: Write the proportion equation
   82,123.60 : 123,012.60 = 68,299.60 : x
2. Step 2: Convert to fraction form
   82,123.60/123,012.60 = 68,299.60/x
3. Step 3: Cross multiply
   82,123.60x = 123,012.60 × 68,299.60
4. Step 4: Simplify right side
   82,123.60x = 8,401,711,374.96
5. Step 5: Solve for x
   x = 8,401,711,374.96/82,123.60
6. Step 6: Final answer
   x = 102,305.69