Finding the Fourth Proportional to 2,870.74, 4,308 and 1,021.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.74 : 4,308 = 1,021.83 : x
2. Step 2: Convert to fraction form
   2,870.74/4,308 = 1,021.83/x
3. Step 3: Cross multiply
   2,870.74x = 4,308 × 1,021.83
4. Step 4: Simplify right side
   2,870.74x = 4,402,043.64
5. Step 5: Solve for x
   x = 4,402,043.64/2,870.74
6. Step 6: Final answer
   x = 1,533.42