Finding the Fourth Proportional to 1,131.57, 1,694.30 and 784.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.57 : 1,694.30 = 784.17 : x
2. Step 2: Convert to fraction form
   1,131.57/1,694.30 = 784.17/x
3. Step 3: Cross multiply
   1,131.57x = 1,694.30 × 784.17
4. Step 4: Simplify right side
   1,131.57x = 1,328,615.31
5. Step 5: Solve for x
   x = 1,328,615.31/1,131.57
6. Step 6: Final answer
   x = 1,174.13