Finding the Fourth Proportional to 28,383.84, 42,590.34 and 12,599.69

Step by Step Solution

1. Step 1: Write the proportion equation
   28,383.84 : 42,590.34 = 12,599.69 : x
2. Step 2: Convert to fraction form
   28,383.84/42,590.34 = 12,599.69/x
3. Step 3: Cross multiply
   28,383.84x = 42,590.34 × 12,599.69
4. Step 4: Simplify right side
   28,383.84x = 536,624,868.04
5. Step 5: Solve for x
   x = 536,624,868.04/28,383.84
6. Step 6: Final answer
   x = 18,906.00