Finding the Fourth Proportional to 19,951.60, 29,931.72 and 9,961.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,951.60 : 29,931.72 = 9,961.72 : x
2. Step 2: Convert to fraction form
   19,951.60/29,931.72 = 9,961.72/x
3. Step 3: Cross multiply
   19,951.60x = 29,931.72 × 9,961.72
4. Step 4: Simplify right side
   19,951.60x = 298,171,264.10
5. Step 5: Solve for x
   x = 298,171,264.10/19,951.60
6. Step 6: Final answer
   x = 14,944.73