Finding the Fourth Proportional to 21,106.93, 29,127.86 and 12,156.03

Step by Step Solution

1. Step 1: Write the proportion equation
   21,106.93 : 29,127.86 = 12,156.03 : x
2. Step 2: Convert to fraction form
   21,106.93/29,127.86 = 12,156.03/x
3. Step 3: Cross multiply
   21,106.93x = 29,127.86 × 12,156.03
4. Step 4: Simplify right side
   21,106.93x = 354,079,140.00
5. Step 5: Solve for x
   x = 354,079,140.00/21,106.93
6. Step 6: Final answer
   x = 16,775.49