Finding the Fourth Proportional to 1,393.72, 2,091.27 and 985.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.72 : 2,091.27 = 985.48 : x
2. Step 2: Convert to fraction form
   1,393.72/2,091.27 = 985.48/x
3. Step 3: Cross multiply
   1,393.72x = 2,091.27 × 985.48
4. Step 4: Simplify right side
   1,393.72x = 2,060,904.76
5. Step 5: Solve for x
   x = 2,060,904.76/1,393.72
6. Step 6: Final answer
   x = 1,478.71