Finding the Fourth Proportional to 21,113.54, 31,657.72 and 7,070.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,113.54 : 31,657.72 = 7,070.16 : x
2. Step 2: Convert to fraction form
   21,113.54/31,657.72 = 7,070.16/x
3. Step 3: Cross multiply
   21,113.54x = 31,657.72 × 7,070.16
4. Step 4: Simplify right side
   21,113.54x = 223,825,145.64
5. Step 5: Solve for x
   x = 223,825,145.64/21,113.54
6. Step 6: Final answer
   x = 10,601.02