Finding the Fourth Proportional to 135,144.72, 186,529.32 and 78,588.72

Step by Step Solution

1. Step 1: Write the proportion equation
   135,144.72 : 186,529.32 = 78,588.72 : x
2. Step 2: Convert to fraction form
   135,144.72/186,529.32 = 78,588.72/x
3. Step 3: Cross multiply
   135,144.72x = 186,529.32 × 78,588.72
4. Step 4: Simplify right side
   135,144.72x = 14,659,100,501.27
5. Step 5: Solve for x
   x = 14,659,100,501.27/135,144.72
6. Step 6: Final answer
   x = 108,469.65