Finding the Third Proportional to 7,773.56 and 12,117.75

Step by Step Solution

1. Step 1: Write the proportion equation
   7,773.56 : 12,117.75 = 12,117.75 : x
2. Step 2: Convert to fraction form
   7,773.56/12,117.75 = 12,117.75/x
3. Step 3: Cross multiply
   7,773.56x = 12,117.75 × 12,117.75
4. Step 4: Simplify right side
   7,773.56x = 146,839,865.06
5. Step 5: Solve for x
   x = 146,839,865.06/7,773.56
6. Step 6: Final answer
   x = 18,889.65