Finding the Third Proportional to 866,815 and 1,291,042

Step by Step Solution

1. Step 1: Write the proportion equation
   866,815 : 1,291,042 = 1,291,042 : x
2. Step 2: Convert to fraction form
   866,815/1,291,042 = 1,291,042/x
3. Step 3: Cross multiply
   866,815x = 1,291,042 × 1,291,042
4. Step 4: Simplify right side
   866,815x = 1,666,789,445,764
5. Step 5: Solve for x
   x = 1,666,789,445,764/866,815
6. Step 6: Final answer
   x = 1,922,889.48