Finding the Fourth Proportional to 1,111.24, 1,533.50 and 613.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.24 : 1,533.50 = 613.91 : x
2. Step 2: Convert to fraction form
   1,111.24/1,533.50 = 613.91/x
3. Step 3: Cross multiply
   1,111.24x = 1,533.50 × 613.91
4. Step 4: Simplify right side
   1,111.24x = 941,430.99
5. Step 5: Solve for x
   x = 941,430.99/1,111.24
6. Step 6: Final answer
   x = 847.19