Finding the Fourth Proportional to 17,428.31, 26,142.55 and 4,280.69

Step by Step Solution

1. Step 1: Write the proportion equation
   17,428.31 : 26,142.55 = 4,280.69 : x
2. Step 2: Convert to fraction form
   17,428.31/26,142.55 = 4,280.69/x
3. Step 3: Cross multiply
   17,428.31x = 26,142.55 × 4,280.69
4. Step 4: Simplify right side
   17,428.31x = 111,908,032.35
5. Step 5: Solve for x
   x = 111,908,032.35/17,428.31
6. Step 6: Final answer
   x = 6,421.05