Finding the Fourth Proportional to 1,407.55, 1,942.35 and 817.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.55 : 1,942.35 = 817.99 : x
2. Step 2: Convert to fraction form
   1,407.55/1,942.35 = 817.99/x
3. Step 3: Cross multiply
   1,407.55x = 1,942.35 × 817.99
4. Step 4: Simplify right side
   1,407.55x = 1,588,822.88
5. Step 5: Solve for x
   x = 1,588,822.88/1,407.55
6. Step 6: Final answer
   x = 1,128.79