Finding the Fourth Proportional to 1,478.72, 2,217.72 and 930.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.72 : 2,217.72 = 930.08 : x
2. Step 2: Convert to fraction form
   1,478.72/2,217.72 = 930.08/x
3. Step 3: Cross multiply
   1,478.72x = 2,217.72 × 930.08
4. Step 4: Simplify right side
   1,478.72x = 2,062,657.02
5. Step 5: Solve for x
   x = 2,062,657.02/1,478.72
6. Step 6: Final answer
   x = 1,394.89