Finding the Fourth Proportional to 82,435.30, 123,912.15 and 80,880.10

Step by Step Solution

1. Step 1: Write the proportion equation
   82,435.30 : 123,912.15 = 80,880.10 : x
2. Step 2: Convert to fraction form
   82,435.30/123,912.15 = 80,880.10/x
3. Step 3: Cross multiply
   82,435.30x = 123,912.15 × 80,880.10
4. Step 4: Simplify right side
   82,435.30x = 10,022,027,083.22
5. Step 5: Solve for x
   x = 10,022,027,083.22/82,435.30
6. Step 6: Final answer
   x = 121,574.46