Finding the Third Proportional to 388,128 and 848,395.50

Step by Step Solution

1. Step 1: Write the proportion equation
   388,128 : 848,395.50 = 848,395.50 : x
2. Step 2: Convert to fraction form
   388,128/848,395.50 = 848,395.50/x
3. Step 3: Cross multiply
   388,128x = 848,395.50 × 848,395.50
4. Step 4: Simplify right side
   388,128x = 719,774,924,420.25
5. Step 5: Solve for x
   x = 719,774,924,420.25/388,128
6. Step 6: Final answer
   x = 1,854,478.22