Finding the Fourth Proportional to 3,145.86, 4,719.40 and 1,066.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,145.86 : 4,719.40 = 1,066.21 : x
2. Step 2: Convert to fraction form
   3,145.86/4,719.40 = 1,066.21/x
3. Step 3: Cross multiply
   3,145.86x = 4,719.40 × 1,066.21
4. Step 4: Simplify right side
   3,145.86x = 5,031,857.01
5. Step 5: Solve for x
   x = 5,031,857.01/3,145.86
6. Step 6: Final answer
   x = 1,599.52