Finding the Fourth Proportional to 1,397.50, 1,928.72 and 808.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.50 : 1,928.72 = 808.04 : x
2. Step 2: Convert to fraction form
   1,397.50/1,928.72 = 808.04/x
3. Step 3: Cross multiply
   1,397.50x = 1,928.72 × 808.04
4. Step 4: Simplify right side
   1,397.50x = 1,558,482.91
5. Step 5: Solve for x
   x = 1,558,482.91/1,397.50
6. Step 6: Final answer
   x = 1,115.19