Finding the Fourth Proportional to 1,641.20, 2,460.18 and 774.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,641.20 : 2,460.18 = 774.50 : x
2. Step 2: Convert to fraction form
   1,641.20/2,460.18 = 774.50/x
3. Step 3: Cross multiply
   1,641.20x = 2,460.18 × 774.50
4. Step 4: Simplify right side
   1,641.20x = 1,905,409.41
5. Step 5: Solve for x
   x = 1,905,409.41/1,641.20
6. Step 6: Final answer
   x = 1,160.99