Finding the Third Proportional to 8,215,870.50 and 12,788,836.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,215,870.50 : 12,788,836.88 = 12,788,836.88 : x
2. Step 2: Convert to fraction form
   8,215,870.50/12,788,836.88 = 12,788,836.88/x
3. Step 3: Cross multiply
   8,215,870.50x = 12,788,836.88 × 12,788,836.88
4. Step 4: Simplify right side
   8,215,870.50x = 163,554,348,615,359.75
5. Step 5: Solve for x
   x = 163,554,348,615,359.75/8,215,870.50
6. Step 6: Final answer
   x = 19,907,123.49