Finding the Fourth Proportional to 78,641.22, 117,856.62 and 28,674.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78,641.22 : 117,856.62 = 28,674.30 : x
2. Step 2: Convert to fraction form
   78,641.22/117,856.62 = 28,674.30/x
3. Step 3: Cross multiply
   78,641.22x = 117,856.62 × 28,674.30
4. Step 4: Simplify right side
   78,641.22x = 3,379,456,078.87
5. Step 5: Solve for x
   x = 3,379,456,078.87/78,641.22
6. Step 6: Final answer
   x = 42,973.09