Finding the Fourth Proportional to 28,088.86, 42,134.15 and 12,285.76

Step by Step Solution

1. Step 1: Write the proportion equation
   28,088.86 : 42,134.15 = 12,285.76 : x
2. Step 2: Convert to fraction form
   28,088.86/42,134.15 = 12,285.76/x
3. Step 3: Cross multiply
   28,088.86x = 42,134.15 × 12,285.76
4. Step 4: Simplify right side
   28,088.86x = 517,649,782.60
5. Step 5: Solve for x
   x = 517,649,782.60/28,088.86
6. Step 6: Final answer
   x = 18,429.01