Finding the Fourth Proportional to 1,111.30, 1,533.63 and 613.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.30 : 1,533.63 = 613.99 : x
2. Step 2: Convert to fraction form
   1,111.30/1,533.63 = 613.99/x
3. Step 3: Cross multiply
   1,111.30x = 1,533.63 × 613.99
4. Step 4: Simplify right side
   1,111.30x = 941,633.48
5. Step 5: Solve for x
   x = 941,633.48/1,111.30
6. Step 6: Final answer
   x = 847.33