Finding the Fourth Proportional to 870.72, 1,300.64 and 741.12

Step by Step Solution

1. Step 1: Write the proportion equation
   870.72 : 1,300.64 = 741.12 : x
2. Step 2: Convert to fraction form
   870.72/1,300.64 = 741.12/x
3. Step 3: Cross multiply
   870.72x = 1,300.64 × 741.12
4. Step 4: Simplify right side
   870.72x = 963,930.32
5. Step 5: Solve for x
   x = 963,930.32/870.72
6. Step 6: Final answer
   x = 1,107.05