Finding the Fourth Proportional to 28,062.72, 42,102.72 and 12,484.80

Step by Step Solution

1. Step 1: Write the proportion equation
   28,062.72 : 42,102.72 = 12,484.80 : x
2. Step 2: Convert to fraction form
   28,062.72/42,102.72 = 12,484.80/x
3. Step 3: Cross multiply
   28,062.72x = 42,102.72 × 12,484.80
4. Step 4: Simplify right side
   28,062.72x = 525,644,038.66
5. Step 5: Solve for x
   x = 525,644,038.66/28,062.72
6. Step 6: Final answer
   x = 18,731.04