Finding the Fourth Proportional to 1,561.47, 2,155.58 and 1,064.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.47 : 2,155.58 = 1,064.94 : x
2. Step 2: Convert to fraction form
   1,561.47/2,155.58 = 1,064.94/x
3. Step 3: Cross multiply
   1,561.47x = 2,155.58 × 1,064.94
4. Step 4: Simplify right side
   1,561.47x = 2,295,563.37
5. Step 5: Solve for x
   x = 2,295,563.37/1,561.47
6. Step 6: Final answer
   x = 1,470.13