Finding the Fourth Proportional to 1,056.09, 1,572 and 1,040.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.09 : 1,572 = 1,040.50 : x
2. Step 2: Convert to fraction form
   1,056.09/1,572 = 1,040.50/x
3. Step 3: Cross multiply
   1,056.09x = 1,572 × 1,040.50
4. Step 4: Simplify right side
   1,056.09x = 1,635,666
5. Step 5: Solve for x
   x = 1,635,666/1,056.09
6. Step 6: Final answer
   x = 1,548.79