Finding the Third Proportional to 19,815 and 42,303

Step by Step Solution

1. Step 1: Write the proportion equation
   19,815 : 42,303 = 42,303 : x
2. Step 2: Convert to fraction form
   19,815/42,303 = 42,303/x
3. Step 3: Cross multiply
   19,815x = 42,303 × 42,303
4. Step 4: Simplify right side
   19,815x = 1,789,543,809
5. Step 5: Solve for x
   x = 1,789,543,809/19,815
6. Step 6: Final answer
   x = 90,312.58