Finding the Fourth Proportional to 1,569.71, 2,166.62 and 979.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,569.71 : 2,166.62 = 979.89 : x
2. Step 2: Convert to fraction form
   1,569.71/2,166.62 = 979.89/x
3. Step 3: Cross multiply
   1,569.71x = 2,166.62 × 979.89
4. Step 4: Simplify right side
   1,569.71x = 2,123,044.37
5. Step 5: Solve for x
   x = 2,123,044.37/1,569.71
6. Step 6: Final answer
   x = 1,352.51