Finding the Fourth Proportional to 1,890.79, 2,605.49 and 1,561.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,890.79 : 2,605.49 = 1,561.52 : x
2. Step 2: Convert to fraction form
   1,890.79/2,605.49 = 1,561.52/x
3. Step 3: Cross multiply
   1,890.79x = 2,605.49 × 1,561.52
4. Step 4: Simplify right side
   1,890.79x = 4,068,524.74
5. Step 5: Solve for x
   x = 4,068,524.74/1,890.79
6. Step 6: Final answer
   x = 2,151.76