Finding the Third Proportional to 309,670.75 and 478,601.25

Step by Step Solution

1. Step 1: Write the proportion equation
   309,670.75 : 478,601.25 = 478,601.25 : x
2. Step 2: Convert to fraction form
   309,670.75/478,601.25 = 478,601.25/x
3. Step 3: Cross multiply
   309,670.75x = 478,601.25 × 478,601.25
4. Step 4: Simplify right side
   309,670.75x = 229,059,156,501.56
5. Step 5: Solve for x
   x = 229,059,156,501.56/309,670.75
6. Step 6: Final answer
   x = 739,686.12