Finding the Fourth Proportional to 78,764.56, 118,158.60 and 28,159.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,764.56 : 118,158.60 = 28,159.72 : x
2. Step 2: Convert to fraction form
   78,764.56/118,158.60 = 28,159.72/x
3. Step 3: Cross multiply
   78,764.56x = 118,158.60 × 28,159.72
4. Step 4: Simplify right side
   78,764.56x = 3,327,313,091.59
5. Step 5: Solve for x
   x = 3,327,313,091.59/78,764.56
6. Step 6: Final answer
   x = 42,243.78