Finding the Fourth Proportional to 1,372.32, 1,893.52 and 820.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.32 : 1,893.52 = 820.64 : x
2. Step 2: Convert to fraction form
   1,372.32/1,893.52 = 820.64/x
3. Step 3: Cross multiply
   1,372.32x = 1,893.52 × 820.64
4. Step 4: Simplify right side
   1,372.32x = 1,553,898.25
5. Step 5: Solve for x
   x = 1,553,898.25/1,372.32
6. Step 6: Final answer
   x = 1,132.31