Finding the Fourth Proportional to 3,870.31, 5,343.23 and 2,547.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.31 : 5,343.23 = 2,547.86 : x
2. Step 2: Convert to fraction form
   3,870.31/5,343.23 = 2,547.86/x
3. Step 3: Cross multiply
   3,870.31x = 5,343.23 × 2,547.86
4. Step 4: Simplify right side
   3,870.31x = 13,613,787.02
5. Step 5: Solve for x
   x = 13,613,787.02/3,870.31
6. Step 6: Final answer
   x = 3,517.50