Finding the Fourth Proportional to 11,188.56, 15,431.76 and 7,405.08

Step by Step Solution

1. Step 1: Write the proportion equation
   11,188.56 : 15,431.76 = 7,405.08 : x
2. Step 2: Convert to fraction form
   11,188.56/15,431.76 = 7,405.08/x
3. Step 3: Cross multiply
   11,188.56x = 15,431.76 × 7,405.08
4. Step 4: Simplify right side
   11,188.56x = 114,273,417.34
5. Step 5: Solve for x
   x = 114,273,417.34/11,188.56
6. Step 6: Final answer
   x = 10,213.42