Finding the Fourth Proportional to 21,218.50, 31,779.30 and 10,133.00

Step by Step Solution

1. Step 1: Write the proportion equation
   21,218.50 : 31,779.30 = 10,133.00 : x
2. Step 2: Convert to fraction form
   21,218.50/31,779.30 = 10,133.00/x
3. Step 3: Cross multiply
   21,218.50x = 31,779.30 × 10,133.00
4. Step 4: Simplify right side
   21,218.50x = 322,019,488.00
5. Step 5: Solve for x
   x = 322,019,488.00/21,218.50
6. Step 6: Final answer
   x = 15,176.36