Finding the Third Proportional to 4,978,818 and 10,140,264

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978,818 : 10,140,264 = 10,140,264 : x
2. Step 2: Convert to fraction form
   4,978,818/10,140,264 = 10,140,264/x
3. Step 3: Cross multiply
   4,978,818x = 10,140,264 × 10,140,264
4. Step 4: Simplify right side
   4,978,818x = 102,824,953,989,696
5. Step 5: Solve for x
   x = 102,824,953,989,696/4,978,818
6. Step 6: Final answer
   x = 20,652,482.98