Finding the Third Proportional to 4,290,086 and 8,877,136

Step by Step Solution

1. Step 1: Write the proportion equation
   4,290,086 : 8,877,136 = 8,877,136 : x
2. Step 2: Convert to fraction form
   4,290,086/8,877,136 = 8,877,136/x
3. Step 3: Cross multiply
   4,290,086x = 8,877,136 × 8,877,136
4. Step 4: Simplify right side
   4,290,086x = 78,803,543,562,496
5. Step 5: Solve for x
   x = 78,803,543,562,496/4,290,086
6. Step 6: Final answer
   x = 18,368,756.14