Finding the Fourth Proportional to 1,396.08, 1,926.86 and 923.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.08 : 1,926.86 = 923.99 : x
2. Step 2: Convert to fraction form
   1,396.08/1,926.86 = 923.99/x
3. Step 3: Cross multiply
   1,396.08x = 1,926.86 × 923.99
4. Step 4: Simplify right side
   1,396.08x = 1,780,389.74
5. Step 5: Solve for x
   x = 1,780,389.74/1,396.08
6. Step 6: Final answer
   x = 1,275.28