Finding the Fourth Proportional to 1,987.83, 2,978.64 and 754.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.83 : 2,978.64 = 754.57 : x
2. Step 2: Convert to fraction form
   1,987.83/2,978.64 = 754.57/x
3. Step 3: Cross multiply
   1,987.83x = 2,978.64 × 754.57
4. Step 4: Simplify right side
   1,987.83x = 2,247,592.38
5. Step 5: Solve for x
   x = 2,247,592.38/1,987.83
6. Step 6: Final answer
   x = 1,130.68