Finding the Third Proportional to 1,243,620 and 2,657,880

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243,620 : 2,657,880 = 2,657,880 : x
2. Step 2: Convert to fraction form
   1,243,620/2,657,880 = 2,657,880/x
3. Step 3: Cross multiply
   1,243,620x = 2,657,880 × 2,657,880
4. Step 4: Simplify right side
   1,243,620x = 7,064,326,094,400
5. Step 5: Solve for x
   x = 7,064,326,094,400/1,243,620
6. Step 6: Final answer
   x = 5,680,453.91