Finding the Third Proportional to 12,156,640 and 19,249,729.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,156,640 : 19,249,729.50 = 19,249,729.50 : x
2. Step 2: Convert to fraction form
   12,156,640/19,249,729.50 = 19,249,729.50/x
3. Step 3: Cross multiply
   12,156,640x = 19,249,729.50 × 19,249,729.50
4. Step 4: Simplify right side
   12,156,640x = 370,552,085,823,170.25
5. Step 5: Solve for x
   x = 370,552,085,823,170.25/12,156,640
6. Step 6: Final answer
   x = 30,481,455.88