Finding the Fourth Proportional to 12,191.58, 18,280.53 and 3,870.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,191.58 : 18,280.53 = 3,870.05 : x
2. Step 2: Convert to fraction form
   12,191.58/18,280.53 = 3,870.05/x
3. Step 3: Cross multiply
   12,191.58x = 18,280.53 × 3,870.05
4. Step 4: Simplify right side
   12,191.58x = 70,746,473.72
5. Step 5: Solve for x
   x = 70,746,473.72/12,191.58
6. Step 6: Final answer
   x = 5,802.90