Finding the Third Proportional to 387,308.25 and 838,957.50

Step by Step Solution

1. Step 1: Write the proportion equation
   387,308.25 : 838,957.50 = 838,957.50 : x
2. Step 2: Convert to fraction form
   387,308.25/838,957.50 = 838,957.50/x
3. Step 3: Cross multiply
   387,308.25x = 838,957.50 × 838,957.50
4. Step 4: Simplify right side
   387,308.25x = 703,849,686,806.25
5. Step 5: Solve for x
   x = 703,849,686,806.25/387,308.25
6. Step 6: Final answer
   x = 1,817,285.55