Finding the Fourth Proportional to 82,310.28, 123,464.52 and 19,980.78

Step by Step Solution

1. Step 1: Write the proportion equation
   82,310.28 : 123,464.52 = 19,980.78 : x
2. Step 2: Convert to fraction form
   82,310.28/123,464.52 = 19,980.78/x
3. Step 3: Cross multiply
   82,310.28x = 123,464.52 × 19,980.78
4. Step 4: Simplify right side
   82,310.28x = 2,466,917,411.93
5. Step 5: Solve for x
   x = 2,466,917,411.93/82,310.28
6. Step 6: Final answer
   x = 29,970.95