Finding the Third Proportional to 4,597,680 and 9,991,200

Step by Step Solution

1. Step 1: Write the proportion equation
   4,597,680 : 9,991,200 = 9,991,200 : x
2. Step 2: Convert to fraction form
   4,597,680/9,991,200 = 9,991,200/x
3. Step 3: Cross multiply
   4,597,680x = 9,991,200 × 9,991,200
4. Step 4: Simplify right side
   4,597,680x = 99,824,077,440,000
5. Step 5: Solve for x
   x = 99,824,077,440,000/4,597,680
6. Step 6: Final answer
   x = 21,711,836.72