Finding the Third Proportional to 316,987,105.50 and 690,248,817

Step by Step Solution

1. Step 1: Write the proportion equation
   316,987,105.50 : 690,248,817 = 690,248,817 : x
2. Step 2: Convert to fraction form
   316,987,105.50/690,248,817 = 690,248,817/x
3. Step 3: Cross multiply
   316,987,105.50x = 690,248,817 × 690,248,817
4. Step 4: Simplify right side
   316,987,105.50x = 476,443,429,369,899,520
5. Step 5: Solve for x
   x = 476,443,429,369,899,520/316,987,105.50
6. Step 6: Final answer
   x = 1,503,037,256.42