Finding the Third Proportional to 30,639.09 and 42,191.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,639.09 : 42,191.72 = 42,191.72 : x
2. Step 2: Convert to fraction form
   30,639.09/42,191.72 = 42,191.72/x
3. Step 3: Cross multiply
   30,639.09x = 42,191.72 × 42,191.72
4. Step 4: Simplify right side
   30,639.09x = 1,780,141,131.08
5. Step 5: Solve for x
   x = 1,780,141,131.08/30,639.09
6. Step 6: Final answer
   x = 58,100.32