Finding the Fourth Proportional to 82,721.34, 124,137.60 and 82,416.99

Step by Step Solution

1. Step 1: Write the proportion equation
   82,721.34 : 124,137.60 = 82,416.99 : x
2. Step 2: Convert to fraction form
   82,721.34/124,137.60 = 82,416.99/x
3. Step 3: Cross multiply
   82,721.34x = 124,137.60 × 82,416.99
4. Step 4: Simplify right side
   82,721.34x = 10,231,047,337.82
5. Step 5: Solve for x
   x = 10,231,047,337.82/82,721.34
6. Step 6: Final answer
   x = 123,680.87