Finding the Fourth Proportional to 1,407.50, 1,942.30 and 818.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.50 : 1,942.30 = 818.02 : x
2. Step 2: Convert to fraction form
   1,407.50/1,942.30 = 818.02/x
3. Step 3: Cross multiply
   1,407.50x = 1,942.30 × 818.02
4. Step 4: Simplify right side
   1,407.50x = 1,588,840.25
5. Step 5: Solve for x
   x = 1,588,840.25/1,407.50
6. Step 6: Final answer
   x = 1,128.84