Finding the Fourth Proportional to 1,559.81, 2,151.77 and 930.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.81 : 2,151.77 = 930.15 : x
2. Step 2: Convert to fraction form
   1,559.81/2,151.77 = 930.15/x
3. Step 3: Cross multiply
   1,559.81x = 2,151.77 × 930.15
4. Step 4: Simplify right side
   1,559.81x = 2,001,464.21
5. Step 5: Solve for x
   x = 2,001,464.21/1,559.81
6. Step 6: Final answer
   x = 1,283.14