Finding the Third Proportional to 291,049.50 and 434,778

Step by Step Solution

1. Step 1: Write the proportion equation
   291,049.50 : 434,778 = 434,778 : x
2. Step 2: Convert to fraction form
   291,049.50/434,778 = 434,778/x
3. Step 3: Cross multiply
   291,049.50x = 434,778 × 434,778
4. Step 4: Simplify right side
   291,049.50x = 189,031,909,284
5. Step 5: Solve for x
   x = 189,031,909,284/291,049.50
6. Step 6: Final answer
   x = 649,483.71