Finding the Fourth Proportional to 28,131.64, 42,203.52 and 8,411.80

Step by Step Solution

1. Step 1: Write the proportion equation
   28,131.64 : 42,203.52 = 8,411.80 : x
2. Step 2: Convert to fraction form
   28,131.64/42,203.52 = 8,411.80/x
3. Step 3: Cross multiply
   28,131.64x = 42,203.52 × 8,411.80
4. Step 4: Simplify right side
   28,131.64x = 355,007,569.54
5. Step 5: Solve for x
   x = 355,007,569.54/28,131.64
6. Step 6: Final answer
   x = 12,619.51