Finding the Fourth Proportional to 1,393.34, 1,922.72 and 763.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.34 : 1,922.72 = 763.86 : x
2. Step 2: Convert to fraction form
   1,393.34/1,922.72 = 763.86/x
3. Step 3: Cross multiply
   1,393.34x = 1,922.72 × 763.86
4. Step 4: Simplify right side
   1,393.34x = 1,468,688.90
5. Step 5: Solve for x
   x = 1,468,688.90/1,393.34
6. Step 6: Final answer
   x = 1,054.08