Finding the Fourth Proportional to 1,432.80, 1,976.40 and 1,012.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,432.80 : 1,976.40 = 1,012.50 : x
2. Step 2: Convert to fraction form
   1,432.80/1,976.40 = 1,012.50/x
3. Step 3: Cross multiply
   1,432.80x = 1,976.40 × 1,012.50
4. Step 4: Simplify right side
   1,432.80x = 2,001,105
5. Step 5: Solve for x
   x = 2,001,105/1,432.80
6. Step 6: Final answer
   x = 1,396.64