Finding the Fourth Proportional to 1,561.34, 2,155.01 and 1,064.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.34 : 2,155.01 = 1,064.18 : x
2. Step 2: Convert to fraction form
   1,561.34/2,155.01 = 1,064.18/x
3. Step 3: Cross multiply
   1,561.34x = 2,155.01 × 1,064.18
4. Step 4: Simplify right side
   1,561.34x = 2,293,318.61
5. Step 5: Solve for x
   x = 2,293,318.61/1,561.34
6. Step 6: Final answer
   x = 1,468.81