Finding the Fourth Proportional to 11,858.18, 16,364.16 and 7,141.55

Step by Step Solution

1. Step 1: Write the proportion equation
   11,858.18 : 16,364.16 = 7,141.55 : x
2. Step 2: Convert to fraction form
   11,858.18/16,364.16 = 7,141.55/x
3. Step 3: Cross multiply
   11,858.18x = 16,364.16 × 7,141.55
4. Step 4: Simplify right side
   11,858.18x = 116,865,385.03
5. Step 5: Solve for x
   x = 116,865,385.03/11,858.18
6. Step 6: Final answer
   x = 9,855.26