Finding the Fourth Proportional to 1,397.36, 1,928.30 and 900.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.36 : 1,928.30 = 900.50 : x
2. Step 2: Convert to fraction form
   1,397.36/1,928.30 = 900.50/x
3. Step 3: Cross multiply
   1,397.36x = 1,928.30 × 900.50
4. Step 4: Simplify right side
   1,397.36x = 1,736,420.01
5. Step 5: Solve for x
   x = 1,736,420.01/1,397.36
6. Step 6: Final answer
   x = 1,242.64