Finding the Fourth Proportional to 1,399.05, 1,931.34 and 901.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.05 : 1,931.34 = 901.98 : x
2. Step 2: Convert to fraction form
   1,399.05/1,931.34 = 901.98/x
3. Step 3: Cross multiply
   1,399.05x = 1,931.34 × 901.98
4. Step 4: Simplify right side
   1,399.05x = 1,742,030.05
5. Step 5: Solve for x
   x = 1,742,030.05/1,399.05
6. Step 6: Final answer
   x = 1,245.15