Finding the Fourth Proportional to 1,436.80, 1,980.06 and 1,152.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.80 : 1,980.06 = 1,152.88 : x
2. Step 2: Convert to fraction form
   1,436.80/1,980.06 = 1,152.88/x
3. Step 3: Cross multiply
   1,436.80x = 1,980.06 × 1,152.88
4. Step 4: Simplify right side
   1,436.80x = 2,282,771.57
5. Step 5: Solve for x
   x = 2,282,771.57/1,436.80
6. Step 6: Final answer
   x = 1,588.79