Finding the Fourth Proportional to 2,128.96, 3,191.52 and 760.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.96 : 3,191.52 = 760.64 : x
2. Step 2: Convert to fraction form
   2,128.96/3,191.52 = 760.64/x
3. Step 3: Cross multiply
   2,128.96x = 3,191.52 × 760.64
4. Step 4: Simplify right side
   2,128.96x = 2,427,597.77
5. Step 5: Solve for x
   x = 2,427,597.77/2,128.96
6. Step 6: Final answer
   x = 1,140.27