Finding the Third Proportional to 12,990,265 and 18,161,155.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,990,265 : 18,161,155.50 = 18,161,155.50 : x
2. Step 2: Convert to fraction form
   12,990,265/18,161,155.50 = 18,161,155.50/x
3. Step 3: Cross multiply
   12,990,265x = 18,161,155.50 × 18,161,155.50
4. Step 4: Simplify right side
   12,990,265x = 329,827,569,095,180.25
5. Step 5: Solve for x
   x = 329,827,569,095,180.25/12,990,265
6. Step 6: Final answer
   x = 25,390,364.95