Finding the Fourth Proportional to 1,814.31, 2,503.60 and 1,006.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,814.31 : 2,503.60 = 1,006.72 : x
2. Step 2: Convert to fraction form
   1,814.31/2,503.60 = 1,006.72/x
3. Step 3: Cross multiply
   1,814.31x = 2,503.60 × 1,006.72
4. Step 4: Simplify right side
   1,814.31x = 2,520,406.64
5. Step 5: Solve for x
   x = 2,520,406.64/1,814.31
6. Step 6: Final answer
   x = 1,389.18