Finding the Third Proportional to 5,402,178 and 8,240,490

Step by Step Solution

1. Step 1: Write the proportion equation
   5,402,178 : 8,240,490 = 8,240,490 : x
2. Step 2: Convert to fraction form
   5,402,178/8,240,490 = 8,240,490/x
3. Step 3: Cross multiply
   5,402,178x = 8,240,490 × 8,240,490
4. Step 4: Simplify right side
   5,402,178x = 67,905,675,440,100
5. Step 5: Solve for x
   x = 67,905,675,440,100/5,402,178
6. Step 6: Final answer
   x = 12,570,055.16