Finding the Third Proportional to 686,154 and 1,066,599

Step by Step Solution

1. Step 1: Write the proportion equation
   686,154 : 1,066,599 = 1,066,599 : x
2. Step 2: Convert to fraction form
   686,154/1,066,599 = 1,066,599/x
3. Step 3: Cross multiply
   686,154x = 1,066,599 × 1,066,599
4. Step 4: Simplify right side
   686,154x = 1,137,633,426,801
5. Step 5: Solve for x
   x = 1,137,633,426,801/686,154
6. Step 6: Final answer
   x = 1,657,985.56