Finding the Fourth Proportional to 21,112.08, 31,672 and 7,070.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,112.08 : 31,672 = 7,070.72 : x
2. Step 2: Convert to fraction form
   21,112.08/31,672 = 7,070.72/x
3. Step 3: Cross multiply
   21,112.08x = 31,672 × 7,070.72
4. Step 4: Simplify right side
   21,112.08x = 223,943,843.84
5. Step 5: Solve for x
   x = 223,943,843.84/21,112.08
6. Step 6: Final answer
   x = 10,607.38