Finding the Fourth Proportional to 1,921.48, 2,884.89 and 997.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.48 : 2,884.89 = 997.72 : x
2. Step 2: Convert to fraction form
   1,921.48/2,884.89 = 997.72/x
3. Step 3: Cross multiply
   1,921.48x = 2,884.89 × 997.72
4. Step 4: Simplify right side
   1,921.48x = 2,878,312.45
5. Step 5: Solve for x
   x = 2,878,312.45/1,921.48
6. Step 6: Final answer
   x = 1,497.97