Finding the Fourth Proportional to 17,731.05, 26,601.78 and 5,251.40

Step by Step Solution

1. Step 1: Write the proportion equation
   17,731.05 : 26,601.78 = 5,251.40 : x
2. Step 2: Convert to fraction form
   17,731.05/26,601.78 = 5,251.40/x
3. Step 3: Cross multiply
   17,731.05x = 26,601.78 × 5,251.40
4. Step 4: Simplify right side
   17,731.05x = 139,696,454.48
5. Step 5: Solve for x
   x = 139,696,454.48/17,731.05
6. Step 6: Final answer
   x = 7,878.63