Finding the Third Proportional to 55,378.69 and 85,915.69

Step by Step Solution

1. Step 1: Write the proportion equation
   55,378.69 : 85,915.69 = 85,915.69 : x
2. Step 2: Convert to fraction form
   55,378.69/85,915.69 = 85,915.69/x
3. Step 3: Cross multiply
   55,378.69x = 85,915.69 × 85,915.69
4. Step 4: Simplify right side
   55,378.69x = 7,381,505,358.60
5. Step 5: Solve for x
   x = 7,381,505,358.60/55,378.69
6. Step 6: Final answer
   x = 133,291.45