Finding the Fourth Proportional to 1,429.55, 2,145.15 and 771.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.55 : 2,145.15 = 771.43 : x
2. Step 2: Convert to fraction form
   1,429.55/2,145.15 = 771.43/x
3. Step 3: Cross multiply
   1,429.55x = 2,145.15 × 771.43
4. Step 4: Simplify right side
   1,429.55x = 1,654,829.63
5. Step 5: Solve for x
   x = 1,654,829.63/1,429.55
6. Step 6: Final answer
   x = 1,157.59