Finding the Fourth Proportional to 1,432.76, 1,977.22 and 811.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,432.76 : 1,977.22 = 811.72 : x
2. Step 2: Convert to fraction form
   1,432.76/1,977.22 = 811.72/x
3. Step 3: Cross multiply
   1,432.76x = 1,977.22 × 811.72
4. Step 4: Simplify right side
   1,432.76x = 1,604,949.02
5. Step 5: Solve for x
   x = 1,604,949.02/1,432.76
6. Step 6: Final answer
   x = 1,120.18