Finding the Fourth Proportional to 1,528.40, 2,111.64 and 1,411.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.40 : 2,111.64 = 1,411.76 : x
2. Step 2: Convert to fraction form
   1,528.40/2,111.64 = 1,411.76/x
3. Step 3: Cross multiply
   1,528.40x = 2,111.64 × 1,411.76
4. Step 4: Simplify right side
   1,528.40x = 2,981,128.89
5. Step 5: Solve for x
   x = 2,981,128.89/1,528.40
6. Step 6: Final answer
   x = 1,950.49