Finding the Third Proportional to 689,645 and 1,076,390

Step by Step Solution

1. Step 1: Write the proportion equation
   689,645 : 1,076,390 = 1,076,390 : x
2. Step 2: Convert to fraction form
   689,645/1,076,390 = 1,076,390/x
3. Step 3: Cross multiply
   689,645x = 1,076,390 × 1,076,390
4. Step 4: Simplify right side
   689,645x = 1,158,615,432,100
5. Step 5: Solve for x
   x = 1,158,615,432,100/689,645
6. Step 6: Final answer
   x = 1,680,017.16