Finding the Fourth Proportional to 1,215.42, 1,677.96 and 1,030.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.42 : 1,677.96 = 1,030.91 : x
2. Step 2: Convert to fraction form
   1,215.42/1,677.96 = 1,030.91/x
3. Step 3: Cross multiply
   1,215.42x = 1,677.96 × 1,030.91
4. Step 4: Simplify right side
   1,215.42x = 1,729,817.35
5. Step 5: Solve for x
   x = 1,729,817.35/1,215.42
6. Step 6: Final answer
   x = 1,423.23