Finding the Fourth Proportional to 2,478.58, 3,715.71 and 938.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478.58 : 3,715.71 = 938.50 : x
2. Step 2: Convert to fraction form
   2,478.58/3,715.71 = 938.50/x
3. Step 3: Cross multiply
   2,478.58x = 3,715.71 × 938.50
4. Step 4: Simplify right side
   2,478.58x = 3,487,193.84
5. Step 5: Solve for x
   x = 3,487,193.84/2,478.58
6. Step 6: Final answer
   x = 1,406.93