Finding the Fourth Proportional to 1,478.72, 2,036.72 and 1,372.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.72 : 2,036.72 = 1,372.40 : x
2. Step 2: Convert to fraction form
   1,478.72/2,036.72 = 1,372.40/x
3. Step 3: Cross multiply
   1,478.72x = 2,036.72 × 1,372.40
4. Step 4: Simplify right side
   1,478.72x = 2,795,194.53
5. Step 5: Solve for x
   x = 2,795,194.53/1,478.72
6. Step 6: Final answer
   x = 1,890.28