Finding the Fourth Proportional to 11,937.69, 17,906.70 and 3,172.56

Step by Step Solution

1. Step 1: Write the proportion equation
   11,937.69 : 17,906.70 = 3,172.56 : x
2. Step 2: Convert to fraction form
   11,937.69/17,906.70 = 3,172.56/x
3. Step 3: Cross multiply
   11,937.69x = 17,906.70 × 3,172.56
4. Step 4: Simplify right side
   11,937.69x = 56,810,080.15
5. Step 5: Solve for x
   x = 56,810,080.15/11,937.69
6. Step 6: Final answer
   x = 4,758.88