Finding the Third Proportional to 5,315.63 and 12,415.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,315.63 : 12,415.78 = 12,415.78 : x
2. Step 2: Convert to fraction form
   5,315.63/12,415.78 = 12,415.78/x
3. Step 3: Cross multiply
   5,315.63x = 12,415.78 × 12,415.78
4. Step 4: Simplify right side
   5,315.63x = 154,151,624.05
5. Step 5: Solve for x
   x = 154,151,624.05/5,315.63
6. Step 6: Final answer
   x = 28,999.72