Finding the Fourth Proportional to 911,100.56, 1,366,781.52 and 280,067.36

Step by Step Solution

1. Step 1: Write the proportion equation
   911,100.56 : 1,366,781.52 = 280,067.36 : x
2. Step 2: Convert to fraction form
   911,100.56/1,366,781.52 = 280,067.36/x
3. Step 3: Cross multiply
   911,100.56x = 1,366,781.52 × 280,067.36
4. Step 4: Simplify right side
   911,100.56x = 382,790,892,003.19
5. Step 5: Solve for x
   x = 382,790,892,003.19/911,100.56
6. Step 6: Final answer
   x = 420,141.21