Finding the Fourth Proportional to 1,397.58, 1,926.55 and 872.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.58 : 1,926.55 = 872.70 : x
2. Step 2: Convert to fraction form
   1,397.58/1,926.55 = 872.70/x
3. Step 3: Cross multiply
   1,397.58x = 1,926.55 × 872.70
4. Step 4: Simplify right side
   1,397.58x = 1,681,300.19
5. Step 5: Solve for x
   x = 1,681,300.19/1,397.58
6. Step 6: Final answer
   x = 1,203.01