Finding the Fourth Proportional to 78,081.62, 117,098.26 and 28,155.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78,081.62 : 117,098.26 = 28,155.30 : x
2. Step 2: Convert to fraction form
   78,081.62/117,098.26 = 28,155.30/x
3. Step 3: Cross multiply
   78,081.62x = 117,098.26 × 28,155.30
4. Step 4: Simplify right side
   78,081.62x = 3,296,936,639.78
5. Step 5: Solve for x
   x = 3,296,936,639.78/78,081.62
6. Step 6: Final answer
   x = 42,224.23