Finding the Fourth Proportional to 28,009.06, 42,009.27 and 12,423.94

Step by Step Solution

1. Step 1: Write the proportion equation
   28,009.06 : 42,009.27 = 12,423.94 : x
2. Step 2: Convert to fraction form
   28,009.06/42,009.27 = 12,423.94/x
3. Step 3: Cross multiply
   28,009.06x = 42,009.27 × 12,423.94
4. Step 4: Simplify right side
   28,009.06x = 521,920,649.92
5. Step 5: Solve for x
   x = 521,920,649.92/28,009.06
6. Step 6: Final answer
   x = 18,633.99