Finding the Fourth Proportional to 2,505.21, 3,458.25 and 1,561.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,505.21 : 3,458.25 = 1,561.47 : x
2. Step 2: Convert to fraction form
   2,505.21/3,458.25 = 1,561.47/x
3. Step 3: Cross multiply
   2,505.21x = 3,458.25 × 1,561.47
4. Step 4: Simplify right side
   2,505.21x = 5,399,953.63
5. Step 5: Solve for x
   x = 5,399,953.63/2,505.21
6. Step 6: Final answer
   x = 2,155.49