Finding the Third Proportional to 688,320 and 1,042,840

Step by Step Solution

1. Step 1: Write the proportion equation
   688,320 : 1,042,840 = 1,042,840 : x
2. Step 2: Convert to fraction form
   688,320/1,042,840 = 1,042,840/x
3. Step 3: Cross multiply
   688,320x = 1,042,840 × 1,042,840
4. Step 4: Simplify right side
   688,320x = 1,087,515,265,600
5. Step 5: Solve for x
   x = 1,087,515,265,600/688,320
6. Step 6: Final answer
   x = 1,579,955.93