Finding the Third Proportional to 390,012.47 and 599,211.42

Step by Step Solution

1. Step 1: Write the proportion equation
   390,012.47 : 599,211.42 = 599,211.42 : x
2. Step 2: Convert to fraction form
   390,012.47/599,211.42 = 599,211.42/x
3. Step 3: Cross multiply
   390,012.47x = 599,211.42 × 599,211.42
4. Step 4: Simplify right side
   390,012.47x = 359,054,328,105.46
5. Step 5: Solve for x
   x = 359,054,328,105.46/390,012.47
6. Step 6: Final answer
   x = 920,622.69