Finding the Fourth Proportional to 82,310.31, 123,465.60 and 19,980.81

Step by Step Solution

1. Step 1: Write the proportion equation
   82,310.31 : 123,465.60 = 19,980.81 : x
2. Step 2: Convert to fraction form
   82,310.31/123,465.60 = 19,980.81/x
3. Step 3: Cross multiply
   82,310.31x = 123,465.60 × 19,980.81
4. Step 4: Simplify right side
   82,310.31x = 2,466,942,695.14
5. Step 5: Solve for x
   x = 2,466,942,695.14/82,310.31
6. Step 6: Final answer
   x = 29,971.25