Finding the Fourth Proportional to 2,896.86, 4,345.54 and 816.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,896.86 : 4,345.54 = 816.88 : x
2. Step 2: Convert to fraction form
   2,896.86/4,345.54 = 816.88/x
3. Step 3: Cross multiply
   2,896.86x = 4,345.54 × 816.88
4. Step 4: Simplify right side
   2,896.86x = 3,549,784.72
5. Step 5: Solve for x
   x = 3,549,784.72/2,896.86
6. Step 6: Final answer
   x = 1,225.39