Finding the Third Proportional to 42,390 and 67,756.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,390 : 67,756.50 = 67,756.50 : x
2. Step 2: Convert to fraction form
   42,390/67,756.50 = 67,756.50/x
3. Step 3: Cross multiply
   42,390x = 67,756.50 × 67,756.50
4. Step 4: Simplify right side
   42,390x = 4,590,943,292.25
5. Step 5: Solve for x
   x = 4,590,943,292.25/42,390
6. Step 6: Final answer
   x = 108,302.51