Finding the Fourth Proportional to 2,345.20, 3,515.34 and 784.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,345.20 : 3,515.34 = 784.82 : x
2. Step 2: Convert to fraction form
   2,345.20/3,515.34 = 784.82/x
3. Step 3: Cross multiply
   2,345.20x = 3,515.34 × 784.82
4. Step 4: Simplify right side
   2,345.20x = 2,758,909.14
5. Step 5: Solve for x
   x = 2,758,909.14/2,345.20
6. Step 6: Final answer
   x = 1,176.41