Finding the Fourth Proportional to 2,870.99, 4,306.88 and 1,021.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.99 : 4,306.88 = 1,021.55 : x
2. Step 2: Convert to fraction form
   2,870.99/4,306.88 = 1,021.55/x
3. Step 3: Cross multiply
   2,870.99x = 4,306.88 × 1,021.55
4. Step 4: Simplify right side
   2,870.99x = 4,399,706.59
5. Step 5: Solve for x
   x = 4,399,706.59/2,870.99
6. Step 6: Final answer
   x = 1,532.47