Finding the Fourth Proportional to 1,400.42, 1,931.59 and 1,213.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.42 : 1,931.59 = 1,213.58 : x
2. Step 2: Convert to fraction form
   1,400.42/1,931.59 = 1,213.58/x
3. Step 3: Cross multiply
   1,400.42x = 1,931.59 × 1,213.58
4. Step 4: Simplify right side
   1,400.42x = 2,344,129.33
5. Step 5: Solve for x
   x = 2,344,129.33/1,400.42
6. Step 6: Final answer
   x = 1,673.88