Finding the Third Proportional to 30,328.50 and 42,415.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,328.50 : 42,415.50 = 42,415.50 : x
2. Step 2: Convert to fraction form
   30,328.50/42,415.50 = 42,415.50/x
3. Step 3: Cross multiply
   30,328.50x = 42,415.50 × 42,415.50
4. Step 4: Simplify right side
   30,328.50x = 1,799,074,640.25
5. Step 5: Solve for x
   x = 1,799,074,640.25/30,328.50
6. Step 6: Final answer
   x = 59,319.61