Finding the Fourth Proportional to 1,564.17, 2,345.79 and 1,289.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,564.17 : 2,345.79 = 1,289.58 : x
2. Step 2: Convert to fraction form
   1,564.17/2,345.79 = 1,289.58/x
3. Step 3: Cross multiply
   1,564.17x = 2,345.79 × 1,289.58
4. Step 4: Simplify right side
   1,564.17x = 3,025,083.87
5. Step 5: Solve for x
   x = 3,025,083.87/1,564.17
6. Step 6: Final answer
   x = 1,933.99