Finding the Fourth Proportional to 19,499.51, 26,899.79 and 12,782.18

Step by Step Solution

1. Step 1: Write the proportion equation
   19,499.51 : 26,899.79 = 12,782.18 : x
2. Step 2: Convert to fraction form
   19,499.51/26,899.79 = 12,782.18/x
3. Step 3: Cross multiply
   19,499.51x = 26,899.79 × 12,782.18
4. Step 4: Simplify right side
   19,499.51x = 343,837,759.33
5. Step 5: Solve for x
   x = 343,837,759.33/19,499.51
6. Step 6: Final answer
   x = 17,633.15