Finding the Fourth Proportional to 12,906.30, 19,360.50 and 5,510.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,906.30 : 19,360.50 = 5,510.91 : x
2. Step 2: Convert to fraction form
   12,906.30/19,360.50 = 5,510.91/x
3. Step 3: Cross multiply
   12,906.30x = 19,360.50 × 5,510.91
4. Step 4: Simplify right side
   12,906.30x = 106,693,973.06
5. Step 5: Solve for x
   x = 106,693,973.06/12,906.30
6. Step 6: Final answer
   x = 8,266.81