Finding the Third Proportional to 281,971,390 and 431,061,540

Step by Step Solution

1. Step 1: Write the proportion equation
   281,971,390 : 431,061,540 = 431,061,540 : x
2. Step 2: Convert to fraction form
   281,971,390/431,061,540 = 431,061,540/x
3. Step 3: Cross multiply
   281,971,390x = 431,061,540 × 431,061,540
4. Step 4: Simplify right side
   281,971,390x = 185,814,051,267,171,584
5. Step 5: Solve for x
   x = 185,814,051,267,171,584/281,971,390
6. Step 6: Final answer
   x = 658,981,931.70