Finding the Fourth Proportional to 1,371.72, 1,892.40 and 928.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.72 : 1,892.40 = 928.92 : x
2. Step 2: Convert to fraction form
   1,371.72/1,892.40 = 928.92/x
3. Step 3: Cross multiply
   1,371.72x = 1,892.40 × 928.92
4. Step 4: Simplify right side
   1,371.72x = 1,757,888.21
5. Step 5: Solve for x
   x = 1,757,888.21/1,371.72
6. Step 6: Final answer
   x = 1,281.52