Finding the Third Proportional to 4,221,020 and 8,591,090

Step by Step Solution

1. Step 1: Write the proportion equation
   4,221,020 : 8,591,090 = 8,591,090 : x
2. Step 2: Convert to fraction form
   4,221,020/8,591,090 = 8,591,090/x
3. Step 3: Cross multiply
   4,221,020x = 8,591,090 × 8,591,090
4. Step 4: Simplify right side
   4,221,020x = 73,806,827,388,100
5. Step 5: Solve for x
   x = 73,806,827,388,100/4,221,020
6. Step 6: Final answer
   x = 17,485,543.16