Finding the Fourth Proportional to 1,105.63, 1,525.46 and 712.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.63 : 1,525.46 = 712.88 : x
2. Step 2: Convert to fraction form
   1,105.63/1,525.46 = 712.88/x
3. Step 3: Cross multiply
   1,105.63x = 1,525.46 × 712.88
4. Step 4: Simplify right side
   1,105.63x = 1,087,470.17
5. Step 5: Solve for x
   x = 1,087,470.17/1,105.63
6. Step 6: Final answer
   x = 983.58