Finding the Third Proportional to 378,798 and 828,811.50

Step by Step Solution

1. Step 1: Write the proportion equation
   378,798 : 828,811.50 = 828,811.50 : x
2. Step 2: Convert to fraction form
   378,798/828,811.50 = 828,811.50/x
3. Step 3: Cross multiply
   378,798x = 828,811.50 × 828,811.50
4. Step 4: Simplify right side
   378,798x = 686,928,502,532.25
5. Step 5: Solve for x
   x = 686,928,502,532.25/378,798
6. Step 6: Final answer
   x = 1,813,442.79