Finding the Third Proportional to 761,880 and 1,638,420

Step by Step Solution

1. Step 1: Write the proportion equation
   761,880 : 1,638,420 = 1,638,420 : x
2. Step 2: Convert to fraction form
   761,880/1,638,420 = 1,638,420/x
3. Step 3: Cross multiply
   761,880x = 1,638,420 × 1,638,420
4. Step 4: Simplify right side
   761,880x = 2,684,420,096,400
5. Step 5: Solve for x
   x = 2,684,420,096,400/761,880
6. Step 6: Final answer
   x = 3,523,415.89