Finding the Fourth Proportional to 5,126.30, 7,687.86 and 1,428.83

Step by Step Solution

1. Step 1: Write the proportion equation
   5,126.30 : 7,687.86 = 1,428.83 : x
2. Step 2: Convert to fraction form
   5,126.30/7,687.86 = 1,428.83/x
3. Step 3: Cross multiply
   5,126.30x = 7,687.86 × 1,428.83
4. Step 4: Simplify right side
   5,126.30x = 10,984,664.22
5. Step 5: Solve for x
   x = 10,984,664.22/5,126.30
6. Step 6: Final answer
   x = 2,142.80