Finding the Fourth Proportional to 12,904.72, 17,817.64 and 10,075.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,904.72 : 17,817.64 = 10,075.28 : x
2. Step 2: Convert to fraction form
   12,904.72/17,817.64 = 10,075.28/x
3. Step 3: Cross multiply
   12,904.72x = 17,817.64 × 10,075.28
4. Step 4: Simplify right side
   12,904.72x = 179,517,711.94
5. Step 5: Solve for x
   x = 179,517,711.94/12,904.72
6. Step 6: Final answer
   x = 13,911.01