Finding the Third Proportional to 5,389,143 and 8,139,665.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,389,143 : 8,139,665.50 = 8,139,665.50 : x
2. Step 2: Convert to fraction form
   5,389,143/8,139,665.50 = 8,139,665.50/x
3. Step 3: Cross multiply
   5,389,143x = 8,139,665.50 × 8,139,665.50
4. Step 4: Simplify right side
   5,389,143x = 66,254,154,451,890.25
5. Step 5: Solve for x
   x = 66,254,154,451,890.25/5,389,143
6. Step 6: Final answer
   x = 12,294,005.64