Finding the Third Proportional to 1,221,172 and 1,868,118

Step by Step Solution

1. Step 1: Write the proportion equation
   1,221,172 : 1,868,118 = 1,868,118 : x
2. Step 2: Convert to fraction form
   1,221,172/1,868,118 = 1,868,118/x
3. Step 3: Cross multiply
   1,221,172x = 1,868,118 × 1,868,118
4. Step 4: Simplify right side
   1,221,172x = 3,489,864,861,924
5. Step 5: Solve for x
   x = 3,489,864,861,924/1,221,172
6. Step 6: Final answer
   x = 2,857,799.61