Finding the Fourth Proportional to 1,815.12, 2,505.06 and 1,029.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815.12 : 2,505.06 = 1,029.15 : x
2. Step 2: Convert to fraction form
   1,815.12/2,505.06 = 1,029.15/x
3. Step 3: Cross multiply
   1,815.12x = 2,505.06 × 1,029.15
4. Step 4: Simplify right side
   1,815.12x = 2,578,082.50
5. Step 5: Solve for x
   x = 2,578,082.50/1,815.12
6. Step 6: Final answer
   x = 1,420.34