Finding the Fourth Proportional to 69,051.12, 103,578.90 and 19,131.69

Step by Step Solution

1. Step 1: Write the proportion equation
   69,051.12 : 103,578.90 = 19,131.69 : x
2. Step 2: Convert to fraction form
   69,051.12/103,578.90 = 19,131.69/x
3. Step 3: Cross multiply
   69,051.12x = 103,578.90 × 19,131.69
4. Step 4: Simplify right side
   69,051.12x = 1,981,639,405.34
5. Step 5: Solve for x
   x = 1,981,639,405.34/69,051.12
6. Step 6: Final answer
   x = 28,698.15