Finding the Fourth Proportional to 1,978.33, 2,967.60 and 1,687.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.33 : 2,967.60 = 1,687.86 : x
2. Step 2: Convert to fraction form
   1,978.33/2,967.60 = 1,687.86/x
3. Step 3: Cross multiply
   1,978.33x = 2,967.60 × 1,687.86
4. Step 4: Simplify right side
   1,978.33x = 5,008,893.34
5. Step 5: Solve for x
   x = 5,008,893.34/1,978.33
6. Step 6: Final answer
   x = 2,531.88