Finding the Fourth Proportional to 1,055.67, 1,456.80 and 613.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.67 : 1,456.80 = 613.57 : x
2. Step 2: Convert to fraction form
   1,055.67/1,456.80 = 613.57/x
3. Step 3: Cross multiply
   1,055.67x = 1,456.80 × 613.57
4. Step 4: Simplify right side
   1,055.67x = 893,848.78
5. Step 5: Solve for x
   x = 893,848.78/1,055.67
6. Step 6: Final answer
   x = 846.71