Finding the Fourth Proportional to 21,188.06, 31,783.61 and 5,605.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,188.06 : 31,783.61 = 5,605.50 : x
2. Step 2: Convert to fraction form
   21,188.06/31,783.61 = 5,605.50/x
3. Step 3: Cross multiply
   21,188.06x = 31,783.61 × 5,605.50
4. Step 4: Simplify right side
   21,188.06x = 178,163,025.86
5. Step 5: Solve for x
   x = 178,163,025.86/21,188.06
6. Step 6: Final answer
   x = 8,408.65