Finding the Fourth Proportional to 2,151.47, 3,219.91 and 1,666.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.47 : 3,219.91 = 1,666.69 : x
2. Step 2: Convert to fraction form
   2,151.47/3,219.91 = 1,666.69/x
3. Step 3: Cross multiply
   2,151.47x = 3,219.91 × 1,666.69
4. Step 4: Simplify right side
   2,151.47x = 5,366,591.80
5. Step 5: Solve for x
   x = 5,366,591.80/2,151.47
6. Step 6: Final answer
   x = 2,494.38