Finding the Fourth Proportional to 21,019.07, 31,528.52 and 6,980.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,019.07 : 31,528.52 = 6,980.15 : x
2. Step 2: Convert to fraction form
   21,019.07/31,528.52 = 6,980.15/x
3. Step 3: Cross multiply
   21,019.07x = 31,528.52 × 6,980.15
4. Step 4: Simplify right side
   21,019.07x = 220,073,606.33
5. Step 5: Solve for x
   x = 220,073,606.33/21,019.07
6. Step 6: Final answer
   x = 10,470.19