Finding the Fourth Proportional to 1,111.31, 1,533.62 and 613.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.31 : 1,533.62 = 613.94 : x
2. Step 2: Convert to fraction form
   1,111.31/1,533.62 = 613.94/x
3. Step 3: Cross multiply
   1,111.31x = 1,533.62 × 613.94
4. Step 4: Simplify right side
   1,111.31x = 941,539.93
5. Step 5: Solve for x
   x = 941,539.93/1,111.31
6. Step 6: Final answer
   x = 847.24