Finding the Fourth Proportional to 21,152.60, 31,722.72 and 7,111.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,152.60 : 31,722.72 = 7,111.04 : x
2. Step 2: Convert to fraction form
   21,152.60/31,722.72 = 7,111.04/x
3. Step 3: Cross multiply
   21,152.60x = 31,722.72 × 7,111.04
4. Step 4: Simplify right side
   21,152.60x = 225,581,530.83
5. Step 5: Solve for x
   x = 225,581,530.83/21,152.60
6. Step 6: Final answer
   x = 10,664.48