Finding the Fourth Proportional to 11,912.19, 17,870.88 and 3,591.57

Step by Step Solution

1. Step 1: Write the proportion equation
   11,912.19 : 17,870.88 = 3,591.57 : x
2. Step 2: Convert to fraction form
   11,912.19/17,870.88 = 3,591.57/x
3. Step 3: Cross multiply
   11,912.19x = 17,870.88 × 3,591.57
4. Step 4: Simplify right side
   11,912.19x = 64,184,516.48
5. Step 5: Solve for x
   x = 64,184,516.48/11,912.19
6. Step 6: Final answer
   x = 5,388.14