Finding the Third Proportional to 5,664,578 and 8,543,877

Step by Step Solution

1. Step 1: Write the proportion equation
   5,664,578 : 8,543,877 = 8,543,877 : x
2. Step 2: Convert to fraction form
   5,664,578/8,543,877 = 8,543,877/x
3. Step 3: Cross multiply
   5,664,578x = 8,543,877 × 8,543,877
4. Step 4: Simplify right side
   5,664,578x = 72,997,834,191,129
5. Step 5: Solve for x
   x = 72,997,834,191,129/5,664,578
6. Step 6: Final answer
   x = 12,886,720.63