Finding the Fourth Proportional to 1,978.68, 2,967.15 and 938.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.68 : 2,967.15 = 938.98 : x
2. Step 2: Convert to fraction form
   1,978.68/2,967.15 = 938.98/x
3. Step 3: Cross multiply
   1,978.68x = 2,967.15 × 938.98
4. Step 4: Simplify right side
   1,978.68x = 2,786,101.74
5. Step 5: Solve for x
   x = 2,786,101.74/1,978.68
6. Step 6: Final answer
   x = 1,408.06