Finding the Fourth Proportional to 1,375.98, 1,898.84 and 816.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.98 : 1,898.84 = 816.72 : x
2. Step 2: Convert to fraction form
   1,375.98/1,898.84 = 816.72/x
3. Step 3: Cross multiply
   1,375.98x = 1,898.84 × 816.72
4. Step 4: Simplify right side
   1,375.98x = 1,550,820.60
5. Step 5: Solve for x
   x = 1,550,820.60/1,375.98
6. Step 6: Final answer
   x = 1,127.07