Finding the Fourth Proportional to 1,478.38, 2,213.90 and 748.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.38 : 2,213.90 = 748.30 : x
2. Step 2: Convert to fraction form
   1,478.38/2,213.90 = 748.30/x
3. Step 3: Cross multiply
   1,478.38x = 2,213.90 × 748.30
4. Step 4: Simplify right side
   1,478.38x = 1,656,661.37
5. Step 5: Solve for x
   x = 1,656,661.37/1,478.38
6. Step 6: Final answer
   x = 1,120.59