Finding the Fourth Proportional to 1,047.76, 1,569.20 and 996.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.76 : 1,569.20 = 996.72 : x
2. Step 2: Convert to fraction form
   1,047.76/1,569.20 = 996.72/x
3. Step 3: Cross multiply
   1,047.76x = 1,569.20 × 996.72
4. Step 4: Simplify right side
   1,047.76x = 1,564,053.02
5. Step 5: Solve for x
   x = 1,564,053.02/1,047.76
6. Step 6: Final answer
   x = 1,492.76