Finding the Fourth Proportional to 1,223.91, 1,836.17 and 607.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,223.91 : 1,836.17 = 607.91 : x
2. Step 2: Convert to fraction form
   1,223.91/1,836.17 = 607.91/x
3. Step 3: Cross multiply
   1,223.91x = 1,836.17 × 607.91
4. Step 4: Simplify right side
   1,223.91x = 1,116,213.88
5. Step 5: Solve for x
   x = 1,116,213.88/1,223.91
6. Step 6: Final answer
   x = 912.01