Finding the Fourth Proportional to 12,903.31, 17,807.75 and 7,867.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,903.31 : 17,807.75 = 7,867.81 : x
2. Step 2: Convert to fraction form
   12,903.31/17,807.75 = 7,867.81/x
3. Step 3: Cross multiply
   12,903.31x = 17,807.75 × 7,867.81
4. Step 4: Simplify right side
   12,903.31x = 140,107,993.53
5. Step 5: Solve for x
   x = 140,107,993.53/12,903.31
6. Step 6: Final answer
   x = 10,858.30