Finding the Fourth Proportional to 1,401.21, 1,933.67 and 771.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.21 : 1,933.67 = 771.72 : x
2. Step 2: Convert to fraction form
   1,401.21/1,933.67 = 771.72/x
3. Step 3: Cross multiply
   1,401.21x = 1,933.67 × 771.72
4. Step 4: Simplify right side
   1,401.21x = 1,492,247.95
5. Step 5: Solve for x
   x = 1,492,247.95/1,401.21
6. Step 6: Final answer
   x = 1,064.97