Finding the Fourth Proportional to 1,390.50, 1,919.06 and 801.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.50 : 1,919.06 = 801.03 : x
2. Step 2: Convert to fraction form
   1,390.50/1,919.06 = 801.03/x
3. Step 3: Cross multiply
   1,390.50x = 1,919.06 × 801.03
4. Step 4: Simplify right side
   1,390.50x = 1,537,224.63
5. Step 5: Solve for x
   x = 1,537,224.63/1,390.50
6. Step 6: Final answer
   x = 1,105.52