Finding the Fourth Proportional to 28,290.61, 42,443.86 and 8,300.58

Step by Step Solution

1. Step 1: Write the proportion equation
   28,290.61 : 42,443.86 = 8,300.58 : x
2. Step 2: Convert to fraction form
   28,290.61/42,443.86 = 8,300.58/x
3. Step 3: Cross multiply
   28,290.61x = 42,443.86 × 8,300.58
4. Step 4: Simplify right side
   28,290.61x = 352,308,655.44
5. Step 5: Solve for x
   x = 352,308,655.44/28,290.61
6. Step 6: Final answer
   x = 12,453.20