Finding the Fourth Proportional to 12,071.56, 18,102.90 and 4,172.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,071.56 : 18,102.90 = 4,172.05 : x
2. Step 2: Convert to fraction form
   12,071.56/18,102.90 = 4,172.05/x
3. Step 3: Cross multiply
   12,071.56x = 18,102.90 × 4,172.05
4. Step 4: Simplify right side
   12,071.56x = 75,526,158.69
5. Step 5: Solve for x
   x = 75,526,158.69/12,071.56
6. Step 6: Final answer
   x = 6,256.54