Finding the Fourth Proportional to 1,396.95, 1,926.72 and 899.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.95 : 1,926.72 = 899.70 : x
2. Step 2: Convert to fraction form
   1,396.95/1,926.72 = 899.70/x
3. Step 3: Cross multiply
   1,396.95x = 1,926.72 × 899.70
4. Step 4: Simplify right side
   1,396.95x = 1,733,469.98
5. Step 5: Solve for x
   x = 1,733,469.98/1,396.95
6. Step 6: Final answer
   x = 1,240.90