Finding the Fourth Proportional to 1,056.42, 1,455.57 and 1,007.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.42 : 1,455.57 = 1,007.28 : x
2. Step 2: Convert to fraction form
   1,056.42/1,455.57 = 1,007.28/x
3. Step 3: Cross multiply
   1,056.42x = 1,455.57 × 1,007.28
4. Step 4: Simplify right side
   1,056.42x = 1,466,166.55
5. Step 5: Solve for x
   x = 1,466,166.55/1,056.42
6. Step 6: Final answer
   x = 1,387.86