Finding the Third Proportional to 145,128.75 and 307,890

Step by Step Solution

1. Step 1: Write the proportion equation
   145,128.75 : 307,890 = 307,890 : x
2. Step 2: Convert to fraction form
   145,128.75/307,890 = 307,890/x
3. Step 3: Cross multiply
   145,128.75x = 307,890 × 307,890
4. Step 4: Simplify right side
   145,128.75x = 94,796,252,100
5. Step 5: Solve for x
   x = 94,796,252,100/145,128.75
6. Step 6: Final answer
   x = 653,187.27