Finding the Fourth Proportional to 13,446.51, 18,555.80 and 7,782.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,446.51 : 18,555.80 = 7,782.18 : x
2. Step 2: Convert to fraction form
   13,446.51/18,555.80 = 7,782.18/x
3. Step 3: Cross multiply
   13,446.51x = 18,555.80 × 7,782.18
4. Step 4: Simplify right side
   13,446.51x = 144,404,536.73
5. Step 5: Solve for x
   x = 144,404,536.73/13,446.51
6. Step 6: Final answer
   x = 10,739.18