Finding the Fourth Proportional to 2,158.95, 3,239.73 and 772.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.95 : 3,239.73 = 772.18 : x
2. Step 2: Convert to fraction form
   2,158.95/3,239.73 = 772.18/x
3. Step 3: Cross multiply
   2,158.95x = 3,239.73 × 772.18
4. Step 4: Simplify right side
   2,158.95x = 2,501,646.61
5. Step 5: Solve for x
   x = 2,501,646.61/2,158.95
6. Step 6: Final answer
   x = 1,158.73