Finding the Fourth Proportional to 14,622.80, 21,931.72 and 5,260.91

Step by Step Solution

1. Step 1: Write the proportion equation
   14,622.80 : 21,931.72 = 5,260.91 : x
2. Step 2: Convert to fraction form
   14,622.80/21,931.72 = 5,260.91/x
3. Step 3: Cross multiply
   14,622.80x = 21,931.72 × 5,260.91
4. Step 4: Simplify right side
   14,622.80x = 115,380,682.25
5. Step 5: Solve for x
   x = 115,380,682.25/14,622.80
6. Step 6: Final answer
   x = 7,890.47