Finding the Third Proportional to 131,312 and 288,040

Step by Step Solution

1. Step 1: Write the proportion equation
   131,312 : 288,040 = 288,040 : x
2. Step 2: Convert to fraction form
   131,312/288,040 = 288,040/x
3. Step 3: Cross multiply
   131,312x = 288,040 × 288,040
4. Step 4: Simplify right side
   131,312x = 82,967,041,600
5. Step 5: Solve for x
   x = 82,967,041,600/131,312
6. Step 6: Final answer
   x = 631,831.38