Finding the Fourth Proportional to 942.72, 1,403.52 and 938.16

Step by Step Solution

1. Step 1: Write the proportion equation
   942.72 : 1,403.52 = 938.16 : x
2. Step 2: Convert to fraction form
   942.72/1,403.52 = 938.16/x
3. Step 3: Cross multiply
   942.72x = 1,403.52 × 938.16
4. Step 4: Simplify right side
   942.72x = 1,316,714.61
5. Step 5: Solve for x
   x = 1,316,714.61/942.72
6. Step 6: Final answer
   x = 1,396.73