Finding the Fourth Proportional to 1,435.56, 1,980.60 and 911.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.56 : 1,980.60 = 911.52 : x
2. Step 2: Convert to fraction form
   1,435.56/1,980.60 = 911.52/x
3. Step 3: Cross multiply
   1,435.56x = 1,980.60 × 911.52
4. Step 4: Simplify right side
   1,435.56x = 1,805,356.51
5. Step 5: Solve for x
   x = 1,805,356.51/1,435.56
6. Step 6: Final answer
   x = 1,257.60