Finding the Third Proportional to 128,608.69 and 183,454.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,608.69 : 183,454.50 = 183,454.50 : x
2. Step 2: Convert to fraction form
   128,608.69/183,454.50 = 183,454.50/x
3. Step 3: Cross multiply
   128,608.69x = 183,454.50 × 183,454.50
4. Step 4: Simplify right side
   128,608.69x = 33,655,553,570.25
5. Step 5: Solve for x
   x = 33,655,553,570.25/128,608.69
6. Step 6: Final answer
   x = 261,689.58