Finding the Third Proportional to 19,931 and 42,291.50

Step by Step Solution

1. Step 1: Write the proportion equation
   19,931 : 42,291.50 = 42,291.50 : x
2. Step 2: Convert to fraction form
   19,931/42,291.50 = 42,291.50/x
3. Step 3: Cross multiply
   19,931x = 42,291.50 × 42,291.50
4. Step 4: Simplify right side
   19,931x = 1,788,570,972.25
5. Step 5: Solve for x
   x = 1,788,570,972.25/19,931
6. Step 6: Final answer
   x = 89,738.15