Finding the Fourth Proportional to 78,105.28, 117,133.71 and 28,178.90

Step by Step Solution

1. Step 1: Write the proportion equation
   78,105.28 : 117,133.71 = 28,178.90 : x
2. Step 2: Convert to fraction form
   78,105.28/117,133.71 = 28,178.90/x
3. Step 3: Cross multiply
   78,105.28x = 117,133.71 × 28,178.90
4. Step 4: Simplify right side
   78,105.28x = 3,300,699,100.72
5. Step 5: Solve for x
   x = 3,300,699,100.72/78,105.28
6. Step 6: Final answer
   x = 42,259.62