Finding the Fourth Proportional to 1,054.72, 1,580.80 and 926.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.72 : 1,580.80 = 926.72 : x
2. Step 2: Convert to fraction form
   1,054.72/1,580.80 = 926.72/x
3. Step 3: Cross multiply
   1,054.72x = 1,580.80 × 926.72
4. Step 4: Simplify right side
   1,054.72x = 1,464,958.98
5. Step 5: Solve for x
   x = 1,464,958.98/1,054.72
6. Step 6: Final answer
   x = 1,388.96