Finding the Fourth Proportional to 28,266.72, 42,399.18 and 12,466.86

Step by Step Solution

1. Step 1: Write the proportion equation
   28,266.72 : 42,399.18 = 12,466.86 : x
2. Step 2: Convert to fraction form
   28,266.72/42,399.18 = 12,466.86/x
3. Step 3: Cross multiply
   28,266.72x = 42,399.18 × 12,466.86
4. Step 4: Simplify right side
   28,266.72x = 528,584,641.17
5. Step 5: Solve for x
   x = 528,584,641.17/28,266.72
6. Step 6: Final answer
   x = 18,699.89