Finding the Third Proportional to 387,329.25 and 838,978.50

Step by Step Solution

1. Step 1: Write the proportion equation
   387,329.25 : 838,978.50 = 838,978.50 : x
2. Step 2: Convert to fraction form
   387,329.25/838,978.50 = 838,978.50/x
3. Step 3: Cross multiply
   387,329.25x = 838,978.50 × 838,978.50
4. Step 4: Simplify right side
   387,329.25x = 703,884,923,462.25
5. Step 5: Solve for x
   x = 703,884,923,462.25/387,329.25
6. Step 6: Final answer
   x = 1,817,278.00