Finding the Third Proportional to 11,890,056 and 18,218,870

Step by Step Solution

1. Step 1: Write the proportion equation
   11,890,056 : 18,218,870 = 18,218,870 : x
2. Step 2: Convert to fraction form
   11,890,056/18,218,870 = 18,218,870/x
3. Step 3: Cross multiply
   11,890,056x = 18,218,870 × 18,218,870
4. Step 4: Simplify right side
   11,890,056x = 331,927,224,076,900
5. Step 5: Solve for x
   x = 331,927,224,076,900/11,890,056
6. Step 6: Final answer
   x = 27,916,371.80