Finding the Third Proportional to 320,139 and 741,055.50

Step by Step Solution

1. Step 1: Write the proportion equation
   320,139 : 741,055.50 = 741,055.50 : x
2. Step 2: Convert to fraction form
   320,139/741,055.50 = 741,055.50/x
3. Step 3: Cross multiply
   320,139x = 741,055.50 × 741,055.50
4. Step 4: Simplify right side
   320,139x = 549,163,254,080.25
5. Step 5: Solve for x
   x = 549,163,254,080.25/320,139
6. Step 6: Final answer
   x = 1,715,390.05