Finding the Fourth Proportional to 78,103.69, 117,131.29 and 28,177.28

Step by Step Solution

1. Step 1: Write the proportion equation
   78,103.69 : 117,131.29 = 28,177.28 : x
2. Step 2: Convert to fraction form
   78,103.69/117,131.29 = 28,177.28/x
3. Step 3: Cross multiply
   78,103.69x = 117,131.29 × 28,177.28
4. Step 4: Simplify right side
   78,103.69x = 3,300,441,155.09
5. Step 5: Solve for x
   x = 3,300,441,155.09/78,103.69
6. Step 6: Final answer
   x = 42,257.17