Finding the Third Proportional to 386,424 and 615,271.50

Step by Step Solution

1. Step 1: Write the proportion equation
   386,424 : 615,271.50 = 615,271.50 : x
2. Step 2: Convert to fraction form
   386,424/615,271.50 = 615,271.50/x
3. Step 3: Cross multiply
   386,424x = 615,271.50 × 615,271.50
4. Step 4: Simplify right side
   386,424x = 378,559,018,712.25
5. Step 5: Solve for x
   x = 378,559,018,712.25/386,424
6. Step 6: Final answer
   x = 979,646.76