Finding the Third Proportional to 5,315.63 and 8,388.56

Step by Step Solution

1. Step 1: Write the proportion equation
   5,315.63 : 8,388.56 = 8,388.56 : x
2. Step 2: Convert to fraction form
   5,315.63/8,388.56 = 8,388.56/x
3. Step 3: Cross multiply
   5,315.63x = 8,388.56 × 8,388.56
4. Step 4: Simplify right side
   5,315.63x = 70,367,980.82
5. Step 5: Solve for x
   x = 70,367,980.82/5,315.63
6. Step 6: Final answer
   x = 13,237.95