Finding the Third Proportional to 5,402,078 and 8,240,280

Step by Step Solution

1. Step 1: Write the proportion equation
   5,402,078 : 8,240,280 = 8,240,280 : x
2. Step 2: Convert to fraction form
   5,402,078/8,240,280 = 8,240,280/x
3. Step 3: Cross multiply
   5,402,078x = 8,240,280 × 8,240,280
4. Step 4: Simplify right side
   5,402,078x = 67,902,214,478,400
5. Step 5: Solve for x
   x = 67,902,214,478,400/5,402,078
6. Step 6: Final answer
   x = 12,569,647.18