Finding the Third Proportional to 265,272 and 390,078

Step by Step Solution

1. Step 1: Write the proportion equation
   265,272 : 390,078 = 390,078 : x
2. Step 2: Convert to fraction form
   265,272/390,078 = 390,078/x
3. Step 3: Cross multiply
   265,272x = 390,078 × 390,078
4. Step 4: Simplify right side
   265,272x = 152,160,846,084
5. Step 5: Solve for x
   x = 152,160,846,084/265,272
6. Step 6: Final answer
   x = 573,603.12