Finding the Fourth Proportional to 12,862.67, 19,276.56 and 5,457.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,862.67 : 19,276.56 = 5,457.86 : x
2. Step 2: Convert to fraction form
   12,862.67/19,276.56 = 5,457.86/x
3. Step 3: Cross multiply
   12,862.67x = 19,276.56 × 5,457.86
4. Step 4: Simplify right side
   12,862.67x = 105,208,669.38
5. Step 5: Solve for x
   x = 105,208,669.38/12,862.67
6. Step 6: Final answer
   x = 8,179.38