Finding the Fourth Proportional to 770.71, 1,155.71 and 308.10

Step by Step Solution

1. Step 1: Write the proportion equation
   770.71 : 1,155.71 = 308.10 : x
2. Step 2: Convert to fraction form
   770.71/1,155.71 = 308.10/x
3. Step 3: Cross multiply
   770.71x = 1,155.71 × 308.10
4. Step 4: Simplify right side
   770.71x = 356,070.59
5. Step 5: Solve for x
   x = 356,070.59/770.71
6. Step 6: Final answer
   x = 462.00