Finding the Fourth Proportional to 69,047.71, 103,573.86 and 19,128.31

Step by Step Solution

1. Step 1: Write the proportion equation
   69,047.71 : 103,573.86 = 19,128.31 : x
2. Step 2: Convert to fraction form
   69,047.71/103,573.86 = 19,128.31/x
3. Step 3: Cross multiply
   69,047.71x = 103,573.86 × 19,128.31
4. Step 4: Simplify right side
   69,047.71x = 1,981,192,901.98
5. Step 5: Solve for x
   x = 1,981,192,901.98/69,047.71
6. Step 6: Final answer
   x = 28,693.10