Finding the Fourth Proportional to 1,529.81, 2,111.20 and 866.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,529.81 : 2,111.20 = 866.71 : x
2. Step 2: Convert to fraction form
   1,529.81/2,111.20 = 866.71/x
3. Step 3: Cross multiply
   1,529.81x = 2,111.20 × 866.71
4. Step 4: Simplify right side
   1,529.81x = 1,829,790.71
5. Step 5: Solve for x
   x = 1,829,790.71/1,529.81
6. Step 6: Final answer
   x = 1,196.09