Finding the Fourth Proportional to 1,390.41, 1,918.76 and 800.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.41 : 1,918.76 = 800.93 : x
2. Step 2: Convert to fraction form
   1,390.41/1,918.76 = 800.93/x
3. Step 3: Cross multiply
   1,390.41x = 1,918.76 × 800.93
4. Step 4: Simplify right side
   1,390.41x = 1,536,799.25
5. Step 5: Solve for x
   x = 1,536,799.25/1,390.41
6. Step 6: Final answer
   x = 1,105.28