Finding the Third Proportional to 8,690,221.50 and 13,147,158

Step by Step Solution

1. Step 1: Write the proportion equation
   8,690,221.50 : 13,147,158 = 13,147,158 : x
2. Step 2: Convert to fraction form
   8,690,221.50/13,147,158 = 13,147,158/x
3. Step 3: Cross multiply
   8,690,221.50x = 13,147,158 × 13,147,158
4. Step 4: Simplify right side
   8,690,221.50x = 172,847,763,476,964
5. Step 5: Solve for x
   x = 172,847,763,476,964/8,690,221.50
6. Step 6: Final answer
   x = 19,889,914.60