Finding the Fourth Proportional to 1,111.02, 1,533.21 and 613.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.02 : 1,533.21 = 613.65 : x
2. Step 2: Convert to fraction form
   1,111.02/1,533.21 = 613.65/x
3. Step 3: Cross multiply
   1,111.02x = 1,533.21 × 613.65
4. Step 4: Simplify right side
   1,111.02x = 940,857.76
5. Step 5: Solve for x
   x = 940,857.76/1,111.02
6. Step 6: Final answer
   x = 846.84