Finding the Third Proportional to 1,223,680 and 1,720,140

Step by Step Solution

1. Step 1: Write the proportion equation
   1,223,680 : 1,720,140 = 1,720,140 : x
2. Step 2: Convert to fraction form
   1,223,680/1,720,140 = 1,720,140/x
3. Step 3: Cross multiply
   1,223,680x = 1,720,140 × 1,720,140
4. Step 4: Simplify right side
   1,223,680x = 2,958,881,619,600
5. Step 5: Solve for x
   x = 2,958,881,619,600/1,223,680
6. Step 6: Final answer
   x = 2,418,019.11