Finding the Fourth Proportional to 1,432.60, 1,976.98 and 811.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,432.60 : 1,976.98 = 811.56 : x
2. Step 2: Convert to fraction form
   1,432.60/1,976.98 = 811.56/x
3. Step 3: Cross multiply
   1,432.60x = 1,976.98 × 811.56
4. Step 4: Simplify right side
   1,432.60x = 1,604,437.89
5. Step 5: Solve for x
   x = 1,604,437.89/1,432.60
6. Step 6: Final answer
   x = 1,119.95