Finding the Fourth Proportional to 1,406.02, 1,939.98 and 816.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.02 : 1,939.98 = 816.21 : x
2. Step 2: Convert to fraction form
   1,406.02/1,939.98 = 816.21/x
3. Step 3: Cross multiply
   1,406.02x = 1,939.98 × 816.21
4. Step 4: Simplify right side
   1,406.02x = 1,583,421.38
5. Step 5: Solve for x
   x = 1,583,421.38/1,406.02
6. Step 6: Final answer
   x = 1,126.17