Finding the Fourth Proportional to 1,111.05, 1,533.33 and 613.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.05 : 1,533.33 = 613.80 : x
2. Step 2: Convert to fraction form
   1,111.05/1,533.33 = 613.80/x
3. Step 3: Cross multiply
   1,111.05x = 1,533.33 × 613.80
4. Step 4: Simplify right side
   1,111.05x = 941,157.95
5. Step 5: Solve for x
   x = 941,157.95/1,111.05
6. Step 6: Final answer
   x = 847.09