Finding the Fourth Proportional to 1,503.10, 2,071.78 and 1,005.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,503.10 : 2,071.78 = 1,005.56 : x
2. Step 2: Convert to fraction form
   1,503.10/2,071.78 = 1,005.56/x
3. Step 3: Cross multiply
   1,503.10x = 2,071.78 × 1,005.56
4. Step 4: Simplify right side
   1,503.10x = 2,083,299.10
5. Step 5: Solve for x
   x = 2,083,299.10/1,503.10
6. Step 6: Final answer
   x = 1,386.00