Finding the Fourth Proportional to 1,407.04, 1,942.14 and 817.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.04 : 1,942.14 = 817.72 : x
2. Step 2: Convert to fraction form
   1,407.04/1,942.14 = 817.72/x
3. Step 3: Cross multiply
   1,407.04x = 1,942.14 × 817.72
4. Step 4: Simplify right side
   1,407.04x = 1,588,126.72
5. Step 5: Solve for x
   x = 1,588,126.72/1,407.04
6. Step 6: Final answer
   x = 1,128.70