Finding the Third Proportional to 290,280 and 426,884.50

Step by Step Solution

1. Step 1: Write the proportion equation
   290,280 : 426,884.50 = 426,884.50 : x
2. Step 2: Convert to fraction form
   290,280/426,884.50 = 426,884.50/x
3. Step 3: Cross multiply
   290,280x = 426,884.50 × 426,884.50
4. Step 4: Simplify right side
   290,280x = 182,230,376,340.25
5. Step 5: Solve for x
   x = 182,230,376,340.25/290,280
6. Step 6: Final answer
   x = 627,774.48