Finding the Fourth Proportional to 1,428.71, 2,141.40 and 1,169.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.71 : 2,141.40 = 1,169.15 : x
2. Step 2: Convert to fraction form
   1,428.71/2,141.40 = 1,169.15/x
3. Step 3: Cross multiply
   1,428.71x = 2,141.40 × 1,169.15
4. Step 4: Simplify right side
   1,428.71x = 2,503,617.81
5. Step 5: Solve for x
   x = 2,503,617.81/1,428.71
6. Step 6: Final answer
   x = 1,752.36