Finding the Third Proportional to 1,921.50 and 5,178

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.50 : 5,178 = 5,178 : x
2. Step 2: Convert to fraction form
   1,921.50/5,178 = 5,178/x
3. Step 3: Cross multiply
   1,921.50x = 5,178 × 5,178
4. Step 4: Simplify right side
   1,921.50x = 26,811,684
5. Step 5: Solve for x
   x = 26,811,684/1,921.50
6. Step 6: Final answer
   x = 13,953.52