Finding the Fourth Proportional to 1,569.15, 2,165.67 and 1,128.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,569.15 : 2,165.67 = 1,128.51 : x
2. Step 2: Convert to fraction form
   1,569.15/2,165.67 = 1,128.51/x
3. Step 3: Cross multiply
   1,569.15x = 2,165.67 × 1,128.51
4. Step 4: Simplify right side
   1,569.15x = 2,443,980.25
5. Step 5: Solve for x
   x = 2,443,980.25/1,569.15
6. Step 6: Final answer
   x = 1,557.52