Finding the Third Proportional to 42,990 and 91,200

Step by Step Solution

1. Step 1: Write the proportion equation
   42,990 : 91,200 = 91,200 : x
2. Step 2: Convert to fraction form
   42,990/91,200 = 91,200/x
3. Step 3: Cross multiply
   42,990x = 91,200 × 91,200
4. Step 4: Simplify right side
   42,990x = 8,317,440,000
5. Step 5: Solve for x
   x = 8,317,440,000/42,990
6. Step 6: Final answer
   x = 193,473.83