Finding the Third Proportional to 145,215 and 308,056.50

Step by Step Solution

1. Step 1: Write the proportion equation
   145,215 : 308,056.50 = 308,056.50 : x
2. Step 2: Convert to fraction form
   145,215/308,056.50 = 308,056.50/x
3. Step 3: Cross multiply
   145,215x = 308,056.50 × 308,056.50
4. Step 4: Simplify right side
   145,215x = 94,898,807,192.25
5. Step 5: Solve for x
   x = 94,898,807,192.25/145,215
6. Step 6: Final answer
   x = 653,505.54