Finding the Fourth Proportional to 2,340.69, 3,510.80 and 780.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,340.69 : 3,510.80 = 780.53 : x
2. Step 2: Convert to fraction form
   2,340.69/3,510.80 = 780.53/x
3. Step 3: Cross multiply
   2,340.69x = 3,510.80 × 780.53
4. Step 4: Simplify right side
   2,340.69x = 2,740,267.17
5. Step 5: Solve for x
   x = 2,740,267.17/2,340.69
6. Step 6: Final answer
   x = 1,170.71