Finding the Third Proportional to 400,258 and 619,090

Step by Step Solution

1. Step 1: Write the proportion equation
   400,258 : 619,090 = 619,090 : x
2. Step 2: Convert to fraction form
   400,258/619,090 = 619,090/x
3. Step 3: Cross multiply
   400,258x = 619,090 × 619,090
4. Step 4: Simplify right side
   400,258x = 383,272,428,100
5. Step 5: Solve for x
   x = 383,272,428,100/400,258
6. Step 6: Final answer
   x = 957,563.44