Finding the Fourth Proportional to 1,340.88, 2,008.72 and 784.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340.88 : 2,008.72 = 784.24 : x
2. Step 2: Convert to fraction form
   1,340.88/2,008.72 = 784.24/x
3. Step 3: Cross multiply
   1,340.88x = 2,008.72 × 784.24
4. Step 4: Simplify right side
   1,340.88x = 1,575,318.57
5. Step 5: Solve for x
   x = 1,575,318.57/1,340.88
6. Step 6: Final answer
   x = 1,174.84