Finding the Fourth Proportional to 12,111.30, 18,171.65 and 5,870.85

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.30 : 18,171.65 = 5,870.85 : x
2. Step 2: Convert to fraction form
   12,111.30/18,171.65 = 5,870.85/x
3. Step 3: Cross multiply
   12,111.30x = 18,171.65 × 5,870.85
4. Step 4: Simplify right side
   12,111.30x = 106,683,002.05
5. Step 5: Solve for x
   x = 106,683,002.05/12,111.30
6. Step 6: Final answer
   x = 8,808.55