Finding the Third Proportional to 53,608.50 and 78,621.56

Step by Step Solution

1. Step 1: Write the proportion equation
   53,608.50 : 78,621.56 = 78,621.56 : x
2. Step 2: Convert to fraction form
   53,608.50/78,621.56 = 78,621.56/x
3. Step 3: Cross multiply
   53,608.50x = 78,621.56 × 78,621.56
4. Step 4: Simplify right side
   53,608.50x = 6,181,350,089.94
5. Step 5: Solve for x
   x = 6,181,350,089.94/53,608.50
6. Step 6: Final answer
   x = 115,305.41