Finding the Fourth Proportional to 948.56, 1,413.12 and 913.72

Step by Step Solution

1. Step 1: Write the proportion equation
   948.56 : 1,413.12 = 913.72 : x
2. Step 2: Convert to fraction form
   948.56/1,413.12 = 913.72/x
3. Step 3: Cross multiply
   948.56x = 1,413.12 × 913.72
4. Step 4: Simplify right side
   948.56x = 1,291,196.01
5. Step 5: Solve for x
   x = 1,291,196.01/948.56
6. Step 6: Final answer
   x = 1,361.22