Finding the Fourth Proportional to 1,393.46, 1,921.65 and 1,061.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.46 : 1,921.65 = 1,061.30 : x
2. Step 2: Convert to fraction form
   1,393.46/1,921.65 = 1,061.30/x
3. Step 3: Cross multiply
   1,393.46x = 1,921.65 × 1,061.30
4. Step 4: Simplify right side
   1,393.46x = 2,039,447.15
5. Step 5: Solve for x
   x = 2,039,447.15/1,393.46
6. Step 6: Final answer
   x = 1,463.58