Finding the Fourth Proportional to 21,827.62, 30,120.72 and 12,875.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,827.62 : 30,120.72 = 12,875.50 : x
2. Step 2: Convert to fraction form
   21,827.62/30,120.72 = 12,875.50/x
3. Step 3: Cross multiply
   21,827.62x = 30,120.72 × 12,875.50
4. Step 4: Simplify right side
   21,827.62x = 387,819,330.36
5. Step 5: Solve for x
   x = 387,819,330.36/21,827.62
6. Step 6: Final answer
   x = 17,767.37