Finding the Fourth Proportional to 2,896.72, 4,345.52 and 921.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,896.72 : 4,345.52 = 921.70 : x
2. Step 2: Convert to fraction form
   2,896.72/4,345.52 = 921.70/x
3. Step 3: Cross multiply
   2,896.72x = 4,345.52 × 921.70
4. Step 4: Simplify right side
   2,896.72x = 4,005,272.86
5. Step 5: Solve for x
   x = 4,005,272.86/2,896.72
6. Step 6: Final answer
   x = 1,382.69