Finding the Third Proportional to 558,144 and 891,072

Step by Step Solution

1. Step 1: Write the proportion equation
   558,144 : 891,072 = 891,072 : x
2. Step 2: Convert to fraction form
   558,144/891,072 = 891,072/x
3. Step 3: Cross multiply
   558,144x = 891,072 × 891,072
4. Step 4: Simplify right side
   558,144x = 794,009,309,184
5. Step 5: Solve for x
   x = 794,009,309,184/558,144
6. Step 6: Final answer
   x = 1,422,588.63