Finding the Third Proportional to 688,140 and 1,042,578

Step by Step Solution

1. Step 1: Write the proportion equation
   688,140 : 1,042,578 = 1,042,578 : x
2. Step 2: Convert to fraction form
   688,140/1,042,578 = 1,042,578/x
3. Step 3: Cross multiply
   688,140x = 1,042,578 × 1,042,578
4. Step 4: Simplify right side
   688,140x = 1,086,968,886,084
5. Step 5: Solve for x
   x = 1,086,968,886,084/688,140
6. Step 6: Final answer
   x = 1,579,575.21