Finding the Fourth Proportional to 69,131.78, 103,697.60 and 19,211.85

Step by Step Solution

1. Step 1: Write the proportion equation
   69,131.78 : 103,697.60 = 19,211.85 : x
2. Step 2: Convert to fraction form
   69,131.78/103,697.60 = 19,211.85/x
3. Step 3: Cross multiply
   69,131.78x = 103,697.60 × 19,211.85
4. Step 4: Simplify right side
   69,131.78x = 1,992,222,736.56
5. Step 5: Solve for x
   x = 1,992,222,736.56/69,131.78
6. Step 6: Final answer
   x = 28,817.76