Finding the Third Proportional to 424,086 and 623,407.50

Step by Step Solution

1. Step 1: Write the proportion equation
   424,086 : 623,407.50 = 623,407.50 : x
2. Step 2: Convert to fraction form
   424,086/623,407.50 = 623,407.50/x
3. Step 3: Cross multiply
   424,086x = 623,407.50 × 623,407.50
4. Step 4: Simplify right side
   424,086x = 388,636,911,056.25
5. Step 5: Solve for x
   x = 388,636,911,056.25/424,086
6. Step 6: Final answer
   x = 916,410.61