Finding the Fourth Proportional to 1,393.72, 1,921.29 and 1,061.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.72 : 1,921.29 = 1,061.56 : x
2. Step 2: Convert to fraction form
   1,393.72/1,921.29 = 1,061.56/x
3. Step 3: Cross multiply
   1,393.72x = 1,921.29 × 1,061.56
4. Step 4: Simplify right side
   1,393.72x = 2,039,564.61
5. Step 5: Solve for x
   x = 2,039,564.61/1,393.72
6. Step 6: Final answer
   x = 1,463.40