Finding the Fourth Proportional to 21,075.16, 31,628.52 and 9,985.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,075.16 : 31,628.52 = 9,985.04 : x
2. Step 2: Convert to fraction form
   21,075.16/31,628.52 = 9,985.04/x
3. Step 3: Cross multiply
   21,075.16x = 31,628.52 × 9,985.04
4. Step 4: Simplify right side
   21,075.16x = 315,812,037.34
5. Step 5: Solve for x
   x = 315,812,037.34/21,075.16
6. Step 6: Final answer
   x = 14,985.04