Finding the Fourth Proportional to 1,111.60, 1,527.88 and 979.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.60 : 1,527.88 = 979.84 : x
2. Step 2: Convert to fraction form
   1,111.60/1,527.88 = 979.84/x
3. Step 3: Cross multiply
   1,111.60x = 1,527.88 × 979.84
4. Step 4: Simplify right side
   1,111.60x = 1,497,077.94
5. Step 5: Solve for x
   x = 1,497,077.94/1,111.60
6. Step 6: Final answer
   x = 1,346.78