Finding the Fourth Proportional to 1,054.86, 1,456.20 and 661.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.86 : 1,456.20 = 661.98 : x
2. Step 2: Convert to fraction form
   1,054.86/1,456.20 = 661.98/x
3. Step 3: Cross multiply
   1,054.86x = 1,456.20 × 661.98
4. Step 4: Simplify right side
   1,054.86x = 963,975.28
5. Step 5: Solve for x
   x = 963,975.28/1,054.86
6. Step 6: Final answer
   x = 913.84