Finding the Fourth Proportional to 28,105.84, 42,164.16 and 12,523.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28,105.84 : 42,164.16 = 12,523.42 : x
2. Step 2: Convert to fraction form
   28,105.84/42,164.16 = 12,523.42/x
3. Step 3: Cross multiply
   28,105.84x = 42,164.16 × 12,523.42
4. Step 4: Simplify right side
   28,105.84x = 528,039,484.63
5. Step 5: Solve for x
   x = 528,039,484.63/28,105.84
6. Step 6: Final answer
   x = 18,787.54