Finding the Fourth Proportional to 2,887.34, 4,330.55 and 939.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,887.34 : 4,330.55 = 939.53 : x
2. Step 2: Convert to fraction form
   2,887.34/4,330.55 = 939.53/x
3. Step 3: Cross multiply
   2,887.34x = 4,330.55 × 939.53
4. Step 4: Simplify right side
   2,887.34x = 4,068,662.34
5. Step 5: Solve for x
   x = 4,068,662.34/2,887.34
6. Step 6: Final answer
   x = 1,409.14