Finding the Fourth Proportional to 1,431.98, 1,976.51 and 872.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.98 : 1,976.51 = 872.82 : x
2. Step 2: Convert to fraction form
   1,431.98/1,976.51 = 872.82/x
3. Step 3: Cross multiply
   1,431.98x = 1,976.51 × 872.82
4. Step 4: Simplify right side
   1,431.98x = 1,725,139.64
5. Step 5: Solve for x
   x = 1,725,139.64/1,431.98
6. Step 6: Final answer
   x = 1,204.72