Finding the Third Proportional to 872,604 and 1,280,178

Step by Step Solution

1. Step 1: Write the proportion equation
   872,604 : 1,280,178 = 1,280,178 : x
2. Step 2: Convert to fraction form
   872,604/1,280,178 = 1,280,178/x
3. Step 3: Cross multiply
   872,604x = 1,280,178 × 1,280,178
4. Step 4: Simplify right side
   872,604x = 1,638,855,711,684
5. Step 5: Solve for x
   x = 1,638,855,711,684/872,604
6. Step 6: Final answer
   x = 1,878,120.79