Finding the Fourth Proportional to 19,111.10, 28,670.72 and 7,424.28

Step by Step Solution

1. Step 1: Write the proportion equation
   19,111.10 : 28,670.72 = 7,424.28 : x
2. Step 2: Convert to fraction form
   19,111.10/28,670.72 = 7,424.28/x
3. Step 3: Cross multiply
   19,111.10x = 28,670.72 × 7,424.28
4. Step 4: Simplify right side
   19,111.10x = 212,859,415.96
5. Step 5: Solve for x
   x = 212,859,415.96/19,111.10
6. Step 6: Final answer
   x = 11,138.00