Finding the Fourth Proportional to 2,050.86, 2,830.81 and 1,387.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,050.86 : 2,830.81 = 1,387.70 : x
2. Step 2: Convert to fraction form
   2,050.86/2,830.81 = 1,387.70/x
3. Step 3: Cross multiply
   2,050.86x = 2,830.81 × 1,387.70
4. Step 4: Simplify right side
   2,050.86x = 3,928,300.88
5. Step 5: Solve for x
   x = 3,928,300.88/2,050.86
6. Step 6: Final answer
   x = 1,915.45