Finding the Fourth Proportional to 257,315.92, 385,978.74 and 79,828.72

Step by Step Solution

1. Step 1: Write the proportion equation
   257,315.92 : 385,978.74 = 79,828.72 : x
2. Step 2: Convert to fraction form
   257,315.92/385,978.74 = 79,828.72/x
3. Step 3: Cross multiply
   257,315.92x = 385,978.74 × 79,828.72
4. Step 4: Simplify right side
   257,315.92x = 30,812,188,761.41
5. Step 5: Solve for x
   x = 30,812,188,761.41/257,315.92
6. Step 6: Final answer
   x = 119,744.59