Finding the Fourth Proportional to 1,111.76, 1,670.52 and 985.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.76 : 1,670.52 = 985.04 : x
2. Step 2: Convert to fraction form
   1,111.76/1,670.52 = 985.04/x
3. Step 3: Cross multiply
   1,111.76x = 1,670.52 × 985.04
4. Step 4: Simplify right side
   1,111.76x = 1,645,529.02
5. Step 5: Solve for x
   x = 1,645,529.02/1,111.76
6. Step 6: Final answer
   x = 1,480.11