Finding the Fourth Proportional to 21,211.50, 31,831.86 and 7,360.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,211.50 : 31,831.86 = 7,360.50 : x
2. Step 2: Convert to fraction form
   21,211.50/31,831.86 = 7,360.50/x
3. Step 3: Cross multiply
   21,211.50x = 31,831.86 × 7,360.50
4. Step 4: Simplify right side
   21,211.50x = 234,298,405.53
5. Step 5: Solve for x
   x = 234,298,405.53/21,211.50
6. Step 6: Final answer
   x = 11,045.82