Finding the Fourth Proportional to 1,978.59, 2,965.95 and 1,112.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.59 : 2,965.95 = 1,112.25 : x
2. Step 2: Convert to fraction form
   1,978.59/2,965.95 = 1,112.25/x
3. Step 3: Cross multiply
   1,978.59x = 2,965.95 × 1,112.25
4. Step 4: Simplify right side
   1,978.59x = 3,298,877.89
5. Step 5: Solve for x
   x = 3,298,877.89/1,978.59
6. Step 6: Final answer
   x = 1,667.29