Finding the Fourth Proportional to 82,307.81, 123,462.02 and 19,978.31

Step by Step Solution

1. Step 1: Write the proportion equation
   82,307.81 : 123,462.02 = 19,978.31 : x
2. Step 2: Convert to fraction form
   82,307.81/123,462.02 = 19,978.31/x
3. Step 3: Cross multiply
   82,307.81x = 123,462.02 × 19,978.31
4. Step 4: Simplify right side
   82,307.81x = 2,466,562,867.39
5. Step 5: Solve for x
   x = 2,466,562,867.39/82,307.81
6. Step 6: Final answer
   x = 29,967.54