Finding the Fourth Proportional to 21,123.04, 29,151.20 and 12,171.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,123.04 : 29,151.20 = 12,171.12 : x
2. Step 2: Convert to fraction form
   21,123.04/29,151.20 = 12,171.12/x
3. Step 3: Cross multiply
   21,123.04x = 29,151.20 × 12,171.12
4. Step 4: Simplify right side
   21,123.04x = 354,802,706.29
5. Step 5: Solve for x
   x = 354,802,706.29/21,123.04
6. Step 6: Final answer
   x = 16,796.96