Finding the Fourth Proportional to 2,339.91, 3,510.01 and 780.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,339.91 : 3,510.01 = 780.06 : x
2. Step 2: Convert to fraction form
   2,339.91/3,510.01 = 780.06/x
3. Step 3: Cross multiply
   2,339.91x = 3,510.01 × 780.06
4. Step 4: Simplify right side
   2,339.91x = 2,738,000.85
5. Step 5: Solve for x
   x = 2,738,000.85/2,339.91
6. Step 6: Final answer
   x = 1,170.13