Finding the Third Proportional to 11,716,221 and 18,139,549.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,716,221 : 18,139,549.50 = 18,139,549.50 : x
2. Step 2: Convert to fraction form
   11,716,221/18,139,549.50 = 18,139,549.50/x
3. Step 3: Cross multiply
   11,716,221x = 18,139,549.50 × 18,139,549.50
4. Step 4: Simplify right side
   11,716,221x = 329,043,256,062,950.25
5. Step 5: Solve for x
   x = 329,043,256,062,950.25/11,716,221
6. Step 6: Final answer
   x = 28,084,418.69