Finding the Fourth Proportional to 11,906.55, 17,858.57 and 4,887.30

Step by Step Solution

1. Step 1: Write the proportion equation
   11,906.55 : 17,858.57 = 4,887.30 : x
2. Step 2: Convert to fraction form
   11,906.55/17,858.57 = 4,887.30/x
3. Step 3: Cross multiply
   11,906.55x = 17,858.57 × 4,887.30
4. Step 4: Simplify right side
   11,906.55x = 87,280,164.72
5. Step 5: Solve for x
   x = 87,280,164.72/11,906.55
6. Step 6: Final answer
   x = 7,330.43