Finding the Fourth Proportional to 1,372.77, 1,894.57 and 813.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.77 : 1,894.57 = 813.42 : x
2. Step 2: Convert to fraction form
   1,372.77/1,894.57 = 813.42/x
3. Step 3: Cross multiply
   1,372.77x = 1,894.57 × 813.42
4. Step 4: Simplify right side
   1,372.77x = 1,541,079.10
5. Step 5: Solve for x
   x = 1,541,079.10/1,372.77
6. Step 6: Final answer
   x = 1,122.61