Finding the Fourth Proportional to 1,435.08, 1,978.98 and 911.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.08 : 1,978.98 = 911.40 : x
2. Step 2: Convert to fraction form
   1,435.08/1,978.98 = 911.40/x
3. Step 3: Cross multiply
   1,435.08x = 1,978.98 × 911.40
4. Step 4: Simplify right side
   1,435.08x = 1,803,642.37
5. Step 5: Solve for x
   x = 1,803,642.37/1,435.08
6. Step 6: Final answer
   x = 1,256.82