Finding the Third Proportional to 1,999,280 and 4,353,520

Step by Step Solution

1. Step 1: Write the proportion equation
   1,999,280 : 4,353,520 = 4,353,520 : x
2. Step 2: Convert to fraction form
   1,999,280/4,353,520 = 4,353,520/x
3. Step 3: Cross multiply
   1,999,280x = 4,353,520 × 4,353,520
4. Step 4: Simplify right side
   1,999,280x = 18,953,136,390,400
5. Step 5: Solve for x
   x = 18,953,136,390,400/1,999,280
6. Step 6: Final answer
   x = 9,479,980.99