Finding the Third Proportional to 43,391.25 and 87,990.75

Step by Step Solution

1. Step 1: Write the proportion equation
   43,391.25 : 87,990.75 = 87,990.75 : x
2. Step 2: Convert to fraction form
   43,391.25/87,990.75 = 87,990.75/x
3. Step 3: Cross multiply
   43,391.25x = 87,990.75 × 87,990.75
4. Step 4: Simplify right side
   43,391.25x = 7,742,372,085.56
5. Step 5: Solve for x
   x = 7,742,372,085.56/43,391.25
6. Step 6: Final answer
   x = 178,431.64