Finding the Fourth Proportional to 1,333.56, 1,987 and 1,188.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,333.56 : 1,987 = 1,188.06 : x
2. Step 2: Convert to fraction form
   1,333.56/1,987 = 1,188.06/x
3. Step 3: Cross multiply
   1,333.56x = 1,987 × 1,188.06
4. Step 4: Simplify right side
   1,333.56x = 2,360,675.22
5. Step 5: Solve for x
   x = 2,360,675.22/1,333.56
6. Step 6: Final answer
   x = 1,770.21