Finding the Third Proportional to 7,111.13 and 12,445.31

Step by Step Solution

1. Step 1: Write the proportion equation
   7,111.13 : 12,445.31 = 12,445.31 : x
2. Step 2: Convert to fraction form
   7,111.13/12,445.31 = 12,445.31/x
3. Step 3: Cross multiply
   7,111.13x = 12,445.31 × 12,445.31
4. Step 4: Simplify right side
   7,111.13x = 154,885,803.22
5. Step 5: Solve for x
   x = 154,885,803.22/7,111.13
6. Step 6: Final answer
   x = 21,780.77