Finding the Third Proportional to 128,978.50 and 267,070

Step by Step Solution

1. Step 1: Write the proportion equation
   128,978.50 : 267,070 = 267,070 : x
2. Step 2: Convert to fraction form
   128,978.50/267,070 = 267,070/x
3. Step 3: Cross multiply
   128,978.50x = 267,070 × 267,070
4. Step 4: Simplify right side
   128,978.50x = 71,326,384,900
5. Step 5: Solve for x
   x = 71,326,384,900/128,978.50
6. Step 6: Final answer
   x = 553,009.88