Finding the Fourth Proportional to 19,116, 28,666.72 and 7,427.68

Step by Step Solution

1. Step 1: Write the proportion equation
   19,116 : 28,666.72 = 7,427.68 : x
2. Step 2: Convert to fraction form
   19,116/28,666.72 = 7,427.68/x
3. Step 3: Cross multiply
   19,116x = 28,666.72 × 7,427.68
4. Step 4: Simplify right side
   19,116x = 212,927,222.81
5. Step 5: Solve for x
   x = 212,927,222.81/19,116
6. Step 6: Final answer
   x = 11,138.69