Finding the Fourth Proportional to 2,815.35, 3,886.02 and 1,820.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,815.35 : 3,886.02 = 1,820.63 : x
2. Step 2: Convert to fraction form
   2,815.35/3,886.02 = 1,820.63/x
3. Step 3: Cross multiply
   2,815.35x = 3,886.02 × 1,820.63
4. Step 4: Simplify right side
   2,815.35x = 7,074,985.16
5. Step 5: Solve for x
   x = 7,074,985.16/2,815.35
6. Step 6: Final answer
   x = 2,513.00