Finding the Fourth Proportional to 1,559.39, 2,151.20 and 929.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.39 : 2,151.20 = 929.72 : x
2. Step 2: Convert to fraction form
   1,559.39/2,151.20 = 929.72/x
3. Step 3: Cross multiply
   1,559.39x = 2,151.20 × 929.72
4. Step 4: Simplify right side
   1,559.39x = 2,000,013.66
5. Step 5: Solve for x
   x = 2,000,013.66/1,559.39
6. Step 6: Final answer
   x = 1,282.56