Finding the Fourth Proportional to 1,399.16, 1,928.76 and 901.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.16 : 1,928.76 = 901.70 : x
2. Step 2: Convert to fraction form
   1,399.16/1,928.76 = 901.70/x
3. Step 3: Cross multiply
   1,399.16x = 1,928.76 × 901.70
4. Step 4: Simplify right side
   1,399.16x = 1,739,162.89
5. Step 5: Solve for x
   x = 1,739,162.89/1,399.16
6. Step 6: Final answer
   x = 1,243.01