Finding the Third Proportional to 290,870 and 634,300

Step by Step Solution

1. Step 1: Write the proportion equation
   290,870 : 634,300 = 634,300 : x
2. Step 2: Convert to fraction form
   290,870/634,300 = 634,300/x
3. Step 3: Cross multiply
   290,870x = 634,300 × 634,300
4. Step 4: Simplify right side
   290,870x = 402,336,490,000
5. Step 5: Solve for x
   x = 402,336,490,000/290,870
6. Step 6: Final answer
   x = 1,383,217.55