Finding the Fourth Proportional to 1,420.04, 2,131.41 and 771.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.04 : 2,131.41 = 771.23 : x
2. Step 2: Convert to fraction form
   1,420.04/2,131.41 = 771.23/x
3. Step 3: Cross multiply
   1,420.04x = 2,131.41 × 771.23
4. Step 4: Simplify right side
   1,420.04x = 1,643,807.33
5. Step 5: Solve for x
   x = 1,643,807.33/1,420.04
6. Step 6: Final answer
   x = 1,157.58