Finding the Fourth Proportional to 1,120.91, 1,679.90 and 536.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,120.91 : 1,679.90 = 536.10 : x
2. Step 2: Convert to fraction form
   1,120.91/1,679.90 = 536.10/x
3. Step 3: Cross multiply
   1,120.91x = 1,679.90 × 536.10
4. Step 4: Simplify right side
   1,120.91x = 900,591.71
5. Step 5: Solve for x
   x = 900,591.71/1,120.91
6. Step 6: Final answer
   x = 803.45