Finding the Fourth Proportional to 21,870.06, 32,805.59 and 7,831.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,870.06 : 32,805.59 = 7,831.04 : x
2. Step 2: Convert to fraction form
   21,870.06/32,805.59 = 7,831.04/x
3. Step 3: Cross multiply
   21,870.06x = 32,805.59 × 7,831.04
4. Step 4: Simplify right side
   21,870.06x = 256,901,887.51
5. Step 5: Solve for x
   x = 256,901,887.51/21,870.06
6. Step 6: Final answer
   x = 11,746.74