Finding the Third Proportional to 28,518.50 and 66,631.25

Step by Step Solution

1. Step 1: Write the proportion equation
   28,518.50 : 66,631.25 = 66,631.25 : x
2. Step 2: Convert to fraction form
   28,518.50/66,631.25 = 66,631.25/x
3. Step 3: Cross multiply
   28,518.50x = 66,631.25 × 66,631.25
4. Step 4: Simplify right side
   28,518.50x = 4,439,723,476.56
5. Step 5: Solve for x
   x = 4,439,723,476.56/28,518.50
6. Step 6: Final answer
   x = 155,678.72