Finding the Third Proportional to 19,487 and 42,087.50

Step by Step Solution

1. Step 1: Write the proportion equation
   19,487 : 42,087.50 = 42,087.50 : x
2. Step 2: Convert to fraction form
   19,487/42,087.50 = 42,087.50/x
3. Step 3: Cross multiply
   19,487x = 42,087.50 × 42,087.50
4. Step 4: Simplify right side
   19,487x = 1,771,357,656.25
5. Step 5: Solve for x
   x = 1,771,357,656.25/19,487
6. Step 6: Final answer
   x = 90,899.45