Finding the Fourth Proportional to 21,100.72, 31,640.46 and 7,055.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,100.72 : 31,640.46 = 7,055.86 : x
2. Step 2: Convert to fraction form
   21,100.72/31,640.46 = 7,055.86/x
3. Step 3: Cross multiply
   21,100.72x = 31,640.46 × 7,055.86
4. Step 4: Simplify right side
   21,100.72x = 223,250,656.10
5. Step 5: Solve for x
   x = 223,250,656.10/21,100.72
6. Step 6: Final answer
   x = 10,580.24