Finding the Fourth Proportional to 12,666.59, 19,006.72 and 5,276.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,666.59 : 19,006.72 = 5,276.15 : x
2. Step 2: Convert to fraction form
   12,666.59/19,006.72 = 5,276.15/x
3. Step 3: Cross multiply
   12,666.59x = 19,006.72 × 5,276.15
4. Step 4: Simplify right side
   12,666.59x = 100,282,305.73
5. Step 5: Solve for x
   x = 100,282,305.73/12,666.59
6. Step 6: Final answer
   x = 7,917.07