Finding the Fourth Proportional to 2,147.91, 2,966.59 and 1,561.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.91 : 2,966.59 = 1,561.06 : x
2. Step 2: Convert to fraction form
   2,147.91/2,966.59 = 1,561.06/x
3. Step 3: Cross multiply
   2,147.91x = 2,966.59 × 1,561.06
4. Step 4: Simplify right side
   2,147.91x = 4,631,024.99
5. Step 5: Solve for x
   x = 4,631,024.99/2,147.91
6. Step 6: Final answer
   x = 2,156.06