Finding the Third Proportional to 390,552 and 589,996.50

Step by Step Solution

1. Step 1: Write the proportion equation
   390,552 : 589,996.50 = 589,996.50 : x
2. Step 2: Convert to fraction form
   390,552/589,996.50 = 589,996.50/x
3. Step 3: Cross multiply
   390,552x = 589,996.50 × 589,996.50
4. Step 4: Simplify right side
   390,552x = 348,095,870,012.25
5. Step 5: Solve for x
   x = 348,095,870,012.25/390,552
6. Step 6: Final answer
   x = 891,291.99