Finding the Fourth Proportional to 21,189.56, 31,785.86 and 5,607

Step by Step Solution

1. Step 1: Write the proportion equation
   21,189.56 : 31,785.86 = 5,607 : x
2. Step 2: Convert to fraction form
   21,189.56/31,785.86 = 5,607/x
3. Step 3: Cross multiply
   21,189.56x = 31,785.86 × 5,607
4. Step 4: Simplify right side
   21,189.56x = 178,223,317.02
5. Step 5: Solve for x
   x = 178,223,317.02/21,189.56
6. Step 6: Final answer
   x = 8,410.90