Finding the Fourth Proportional to 2,159.73, 2,978.82 and 1,861.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.73 : 2,978.82 = 1,861.52 : x
2. Step 2: Convert to fraction form
   2,159.73/2,978.82 = 1,861.52/x
3. Step 3: Cross multiply
   2,159.73x = 2,978.82 × 1,861.52
4. Step 4: Simplify right side
   2,159.73x = 5,545,118.11
5. Step 5: Solve for x
   x = 5,545,118.11/2,159.73
6. Step 6: Final answer
   x = 2,567.51