Finding the Fourth Proportional to 1,397.55, 1,928.05 and 838.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.55 : 1,928.05 = 838.03 : x
2. Step 2: Convert to fraction form
   1,397.55/1,928.05 = 838.03/x
3. Step 3: Cross multiply
   1,397.55x = 1,928.05 × 838.03
4. Step 4: Simplify right side
   1,397.55x = 1,615,763.74
5. Step 5: Solve for x
   x = 1,615,763.74/1,397.55
6. Step 6: Final answer
   x = 1,156.14