Finding the Third Proportional to 128,979.50 and 267,072

Step by Step Solution

1. Step 1: Write the proportion equation
   128,979.50 : 267,072 = 267,072 : x
2. Step 2: Convert to fraction form
   128,979.50/267,072 = 267,072/x
3. Step 3: Cross multiply
   128,979.50x = 267,072 × 267,072
4. Step 4: Simplify right side
   128,979.50x = 71,327,453,184
5. Step 5: Solve for x
   x = 71,327,453,184/128,979.50
6. Step 6: Final answer
   x = 553,013.88