Finding the Fourth Proportional to 1,396.42, 1,926.72 and 790.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.42 : 1,926.72 = 790.77 : x
2. Step 2: Convert to fraction form
   1,396.42/1,926.72 = 790.77/x
3. Step 3: Cross multiply
   1,396.42x = 1,926.72 × 790.77
4. Step 4: Simplify right side
   1,396.42x = 1,523,598.49
5. Step 5: Solve for x
   x = 1,523,598.49/1,396.42
6. Step 6: Final answer
   x = 1,091.07