Finding the Fourth Proportional to 28,117.62, 42,134.81 and 12,308.04

Step by Step Solution

1. Step 1: Write the proportion equation
   28,117.62 : 42,134.81 = 12,308.04 : x
2. Step 2: Convert to fraction form
   28,117.62/42,134.81 = 12,308.04/x
3. Step 3: Cross multiply
   28,117.62x = 42,134.81 × 12,308.04
4. Step 4: Simplify right side
   28,117.62x = 518,596,865.33
5. Step 5: Solve for x
   x = 518,596,865.33/28,117.62
6. Step 6: Final answer
   x = 18,443.84