Finding the Fourth Proportional to 1,019.88, 1,528.26 and 727.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.88 : 1,528.26 = 727.91 : x
2. Step 2: Convert to fraction form
   1,019.88/1,528.26 = 727.91/x
3. Step 3: Cross multiply
   1,019.88x = 1,528.26 × 727.91
4. Step 4: Simplify right side
   1,019.88x = 1,112,428.10
5. Step 5: Solve for x
   x = 1,112,428.10/1,019.88
6. Step 6: Final answer
   x = 1,090.74