Finding the Third Proportional to 4,290,090 and 8,877,144

Step by Step Solution

1. Step 1: Write the proportion equation
   4,290,090 : 8,877,144 = 8,877,144 : x
2. Step 2: Convert to fraction form
   4,290,090/8,877,144 = 8,877,144/x
3. Step 3: Cross multiply
   4,290,090x = 8,877,144 × 8,877,144
4. Step 4: Simplify right side
   4,290,090x = 78,803,685,596,736
5. Step 5: Solve for x
   x = 78,803,685,596,736/4,290,090
6. Step 6: Final answer
   x = 18,368,772.12