Finding the Third Proportional to 7,860,679.50 and 12,499,618.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,860,679.50 : 12,499,618.50 = 12,499,618.50 : x
2. Step 2: Convert to fraction form
   7,860,679.50/12,499,618.50 = 12,499,618.50/x
3. Step 3: Cross multiply
   7,860,679.50x = 12,499,618.50 × 12,499,618.50
4. Step 4: Simplify right side
   7,860,679.50x = 156,240,462,645,542.25
5. Step 5: Solve for x
   x = 156,240,462,645,542.25/7,860,679.50
6. Step 6: Final answer
   x = 19,876,203.15