Finding the Third Proportional to 417,390 and 626,170.50

Step by Step Solution

1. Step 1: Write the proportion equation
   417,390 : 626,170.50 = 626,170.50 : x
2. Step 2: Convert to fraction form
   417,390/626,170.50 = 626,170.50/x
3. Step 3: Cross multiply
   417,390x = 626,170.50 × 626,170.50
4. Step 4: Simplify right side
   417,390x = 392,089,495,070.25
5. Step 5: Solve for x
   x = 392,089,495,070.25/417,390
6. Step 6: Final answer
   x = 939,384.02