Finding the Fourth Proportional to 3,621.87, 5,429.52 and 1,312.83

Step by Step Solution

1. Step 1: Write the proportion equation
   3,621.87 : 5,429.52 = 1,312.83 : x
2. Step 2: Convert to fraction form
   3,621.87/5,429.52 = 1,312.83/x
3. Step 3: Cross multiply
   3,621.87x = 5,429.52 × 1,312.83
4. Step 4: Simplify right side
   3,621.87x = 7,128,036.74
5. Step 5: Solve for x
   x = 7,128,036.74/3,621.87
6. Step 6: Final answer
   x = 1,968.05