Finding the Fourth Proportional to 78,106.64, 117,135.72 and 28,180.25

Step by Step Solution

1. Step 1: Write the proportion equation
   78,106.64 : 117,135.72 = 28,180.25 : x
2. Step 2: Convert to fraction form
   78,106.64/117,135.72 = 28,180.25/x
3. Step 3: Cross multiply
   78,106.64x = 117,135.72 × 28,180.25
4. Step 4: Simplify right side
   78,106.64x = 3,300,913,287.85
5. Step 5: Solve for x
   x = 3,300,913,287.85/78,106.64
6. Step 6: Final answer
   x = 42,261.62