Finding the Fourth Proportional to 78,618.93, 108,495.41 and 42,809.64

Step by Step Solution

1. Step 1: Write the proportion equation
   78,618.93 : 108,495.41 = 42,809.64 : x
2. Step 2: Convert to fraction form
   78,618.93/108,495.41 = 42,809.64/x
3. Step 3: Cross multiply
   78,618.93x = 108,495.41 × 42,809.64
4. Step 4: Simplify right side
   78,618.93x = 4,644,649,443.75
5. Step 5: Solve for x
   x = 4,644,649,443.75/78,618.93
6. Step 6: Final answer
   x = 59,078.00