Finding the Fourth Proportional to 1,397.70, 1,926.72 and 872.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.70 : 1,926.72 = 872.82 : x
2. Step 2: Convert to fraction form
   1,397.70/1,926.72 = 872.82/x
3. Step 3: Cross multiply
   1,397.70x = 1,926.72 × 872.82
4. Step 4: Simplify right side
   1,397.70x = 1,681,679.75
5. Step 5: Solve for x
   x = 1,681,679.75/1,397.70
6. Step 6: Final answer
   x = 1,203.18