Finding the Fourth Proportional to 21,022.83, 31,526.55 and 6,980.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,022.83 : 31,526.55 = 6,980.31 : x
2. Step 2: Convert to fraction form
   21,022.83/31,526.55 = 6,980.31/x
3. Step 3: Cross multiply
   21,022.83x = 31,526.55 × 6,980.31
4. Step 4: Simplify right side
   21,022.83x = 220,065,092.23
5. Step 5: Solve for x
   x = 220,065,092.23/21,022.83
6. Step 6: Final answer
   x = 10,467.91