Finding the Third Proportional to 2,558,580 and 5,515,720.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558,580 : 5,515,720.50 = 5,515,720.50 : x
2. Step 2: Convert to fraction form
   2,558,580/5,515,720.50 = 5,515,720.50/x
3. Step 3: Cross multiply
   2,558,580x = 5,515,720.50 × 5,515,720.50
4. Step 4: Simplify right side
   2,558,580x = 30,423,172,634,120.25
5. Step 5: Solve for x
   x = 30,423,172,634,120.25/2,558,580
6. Step 6: Final answer
   x = 11,890,647.40