Finding the Third Proportional to 214,899.50 and 290,818

Step by Step Solution

1. Step 1: Write the proportion equation
   214,899.50 : 290,818 = 290,818 : x
2. Step 2: Convert to fraction form
   214,899.50/290,818 = 290,818/x
3. Step 3: Cross multiply
   214,899.50x = 290,818 × 290,818
4. Step 4: Simplify right side
   214,899.50x = 84,575,109,124
5. Step 5: Solve for x
   x = 84,575,109,124/214,899.50
6. Step 6: Final answer
   x = 393,556.57