Finding the Fourth Proportional to 1,400.28, 1,931.94 and 810.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.28 : 1,931.94 = 810.60 : x
2. Step 2: Convert to fraction form
   1,400.28/1,931.94 = 810.60/x
3. Step 3: Cross multiply
   1,400.28x = 1,931.94 × 810.60
4. Step 4: Simplify right side
   1,400.28x = 1,566,030.56
5. Step 5: Solve for x
   x = 1,566,030.56/1,400.28
6. Step 6: Final answer
   x = 1,118.37