Finding the Fourth Proportional to 268,978.31, 403,478.60 and 79,438.71

Step by Step Solution

1. Step 1: Write the proportion equation
   268,978.31 : 403,478.60 = 79,438.71 : x
2. Step 2: Convert to fraction form
   268,978.31/403,478.60 = 79,438.71/x
3. Step 3: Cross multiply
   268,978.31x = 403,478.60 × 79,438.71
4. Step 4: Simplify right side
   268,978.31x = 32,051,819,099.41
5. Step 5: Solve for x
   x = 32,051,819,099.41/268,978.31
6. Step 6: Final answer
   x = 119,161.35