Finding the Fourth Proportional to 1,015.56, 1,401.75 and 661.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.56 : 1,401.75 = 661.47 : x
2. Step 2: Convert to fraction form
   1,015.56/1,401.75 = 661.47/x
3. Step 3: Cross multiply
   1,015.56x = 1,401.75 × 661.47
4. Step 4: Simplify right side
   1,015.56x = 927,215.57
5. Step 5: Solve for x
   x = 927,215.57/1,015.56
6. Step 6: Final answer
   x = 913.01