Finding the Third Proportional to 310,386 and 474,603.75

Step by Step Solution

1. Step 1: Write the proportion equation
   310,386 : 474,603.75 = 474,603.75 : x
2. Step 2: Convert to fraction form
   310,386/474,603.75 = 474,603.75/x
3. Step 3: Cross multiply
   310,386x = 474,603.75 × 474,603.75
4. Step 4: Simplify right side
   310,386x = 225,248,719,514.06
5. Step 5: Solve for x
   x = 225,248,719,514.06/310,386
6. Step 6: Final answer
   x = 725,705.15