Finding the Third Proportional to 426,339 and 615,936.75

Step by Step Solution

1. Step 1: Write the proportion equation
   426,339 : 615,936.75 = 615,936.75 : x
2. Step 2: Convert to fraction form
   426,339/615,936.75 = 615,936.75/x
3. Step 3: Cross multiply
   426,339x = 615,936.75 × 615,936.75
4. Step 4: Simplify right side
   426,339x = 379,378,080,000.56
5. Step 5: Solve for x
   x = 379,378,080,000.56/426,339
6. Step 6: Final answer
   x = 889,850.75