Finding the Third Proportional to 1,815,440 and 4,279,417

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815,440 : 4,279,417 = 4,279,417 : x
2. Step 2: Convert to fraction form
   1,815,440/4,279,417 = 4,279,417/x
3. Step 3: Cross multiply
   1,815,440x = 4,279,417 × 4,279,417
4. Step 4: Simplify right side
   1,815,440x = 18,313,409,859,889
5. Step 5: Solve for x
   x = 18,313,409,859,889/1,815,440
6. Step 6: Final answer
   x = 10,087,587.50