Finding the Fourth Proportional to 82,138.65, 123,207.17 and 25,978.74

Step by Step Solution

1. Step 1: Write the proportion equation
   82,138.65 : 123,207.17 = 25,978.74 : x
2. Step 2: Convert to fraction form
   82,138.65/123,207.17 = 25,978.74/x
3. Step 3: Cross multiply
   82,138.65x = 123,207.17 × 25,978.74
4. Step 4: Simplify right side
   82,138.65x = 3,200,766,905.67
5. Step 5: Solve for x
   x = 3,200,766,905.67/82,138.65
6. Step 6: Final answer
   x = 38,967.85