Finding the Fourth Proportional to 11,899.30, 16,415.52 and 8,364.55

Step by Step Solution

1. Step 1: Write the proportion equation
   11,899.30 : 16,415.52 = 8,364.55 : x
2. Step 2: Convert to fraction form
   11,899.30/16,415.52 = 8,364.55/x
3. Step 3: Cross multiply
   11,899.30x = 16,415.52 × 8,364.55
4. Step 4: Simplify right side
   11,899.30x = 137,308,437.82
5. Step 5: Solve for x
   x = 137,308,437.82/11,899.30
6. Step 6: Final answer
   x = 11,539.20