Finding the Fourth Proportional to 12,886.15, 17,782.89 and 7,850.37

Step by Step Solution

1. Step 1: Write the proportion equation
   12,886.15 : 17,782.89 = 7,850.37 : x
2. Step 2: Convert to fraction form
   12,886.15/17,782.89 = 7,850.37/x
3. Step 3: Cross multiply
   12,886.15x = 17,782.89 × 7,850.37
4. Step 4: Simplify right side
   12,886.15x = 139,602,266.17
5. Step 5: Solve for x
   x = 139,602,266.17/12,886.15
6. Step 6: Final answer
   x = 10,833.51