Finding the Fourth Proportional to 21,189.31, 31,785.49 and 5,606.75

Step by Step Solution

1. Step 1: Write the proportion equation
   21,189.31 : 31,785.49 = 5,606.75 : x
2. Step 2: Convert to fraction form
   21,189.31/31,785.49 = 5,606.75/x
3. Step 3: Cross multiply
   21,189.31x = 31,785.49 × 5,606.75
4. Step 4: Simplify right side
   21,189.31x = 178,213,268.02
5. Step 5: Solve for x
   x = 178,213,268.02/21,189.31
6. Step 6: Final answer
   x = 8,410.53