Finding the Fourth Proportional to 3,129.30, 4,317.89 and 1,870.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,129.30 : 4,317.89 = 1,870.86 : x
2. Step 2: Convert to fraction form
   3,129.30/4,317.89 = 1,870.86/x
3. Step 3: Cross multiply
   3,129.30x = 4,317.89 × 1,870.86
4. Step 4: Simplify right side
   3,129.30x = 8,078,167.69
5. Step 5: Solve for x
   x = 8,078,167.69/3,129.30
6. Step 6: Final answer
   x = 2,581.46