Finding the Fourth Proportional to 2,158.95, 3,237.75 and 772.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.95 : 3,237.75 = 772.09 : x
2. Step 2: Convert to fraction form
   2,158.95/3,237.75 = 772.09/x
3. Step 3: Cross multiply
   2,158.95x = 3,237.75 × 772.09
4. Step 4: Simplify right side
   2,158.95x = 2,499,834.40
5. Step 5: Solve for x
   x = 2,499,834.40/2,158.95
6. Step 6: Final answer
   x = 1,157.89