Finding the Third Proportional to 28,690.50 and 43,642.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,690.50 : 43,642.50 = 43,642.50 : x
2. Step 2: Convert to fraction form
   28,690.50/43,642.50 = 43,642.50/x
3. Step 3: Cross multiply
   28,690.50x = 43,642.50 × 43,642.50
4. Step 4: Simplify right side
   28,690.50x = 1,904,667,806.25
5. Step 5: Solve for x
   x = 1,904,667,806.25/28,690.50
6. Step 6: Final answer
   x = 66,386.71