Finding the Third Proportional to 9,428.59 and 19,631.74

Step by Step Solution

1. Step 1: Write the proportion equation
   9,428.59 : 19,631.74 = 19,631.74 : x
2. Step 2: Convert to fraction form
   9,428.59/19,631.74 = 19,631.74/x
3. Step 3: Cross multiply
   9,428.59x = 19,631.74 × 19,631.74
4. Step 4: Simplify right side
   9,428.59x = 385,405,301.32
5. Step 5: Solve for x
   x = 385,405,301.32/9,428.59
6. Step 6: Final answer
   x = 40,876.24