Finding the Third Proportional to 128,980.50 and 199,303.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,980.50 : 199,303.50 = 199,303.50 : x
2. Step 2: Convert to fraction form
   128,980.50/199,303.50 = 199,303.50/x
3. Step 3: Cross multiply
   128,980.50x = 199,303.50 × 199,303.50
4. Step 4: Simplify right side
   128,980.50x = 39,721,885,112.25
5. Step 5: Solve for x
   x = 39,721,885,112.25/128,980.50
6. Step 6: Final answer
   x = 307,968.14