Finding the Fourth Proportional to 28,300.86, 42,457.41 and 8,580.87

Step by Step Solution

1. Step 1: Write the proportion equation
   28,300.86 : 42,457.41 = 8,580.87 : x
2. Step 2: Convert to fraction form
   28,300.86/42,457.41 = 8,580.87/x
3. Step 3: Cross multiply
   28,300.86x = 42,457.41 × 8,580.87
4. Step 4: Simplify right side
   28,300.86x = 364,321,515.75
5. Step 5: Solve for x
   x = 364,321,515.75/28,300.86
6. Step 6: Final answer
   x = 12,873.16