Finding the Third Proportional to 438,619.50 and 549,054

Step by Step Solution

1. Step 1: Write the proportion equation
   438,619.50 : 549,054 = 549,054 : x
2. Step 2: Convert to fraction form
   438,619.50/549,054 = 549,054/x
3. Step 3: Cross multiply
   438,619.50x = 549,054 × 549,054
4. Step 4: Simplify right side
   438,619.50x = 301,460,294,916
5. Step 5: Solve for x
   x = 301,460,294,916/438,619.50
6. Step 6: Final answer
   x = 687,293.42