Finding the Fourth Proportional to 21,017.16, 31,526.64 and 9,783.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,017.16 : 31,526.64 = 9,783.05 : x
2. Step 2: Convert to fraction form
   21,017.16/31,526.64 = 9,783.05/x
3. Step 3: Cross multiply
   21,017.16x = 31,526.64 × 9,783.05
4. Step 4: Simplify right side
   21,017.16x = 308,426,537.82
5. Step 5: Solve for x
   x = 308,426,537.82/21,017.16
6. Step 6: Final answer
   x = 14,674.99