Finding the Fourth Proportional to 12,888.84, 17,786.57 and 7,853.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,888.84 : 17,786.57 = 7,853.06 : x
2. Step 2: Convert to fraction form
   12,888.84/17,786.57 = 7,853.06/x
3. Step 3: Cross multiply
   12,888.84x = 17,786.57 × 7,853.06
4. Step 4: Simplify right side
   12,888.84x = 139,679,006.61
5. Step 5: Solve for x
   x = 139,679,006.61/12,888.84
6. Step 6: Final answer
   x = 10,837.20