Finding the Fourth Proportional to 11,955.87, 16,501.86 and 7,978.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,955.87 : 16,501.86 = 7,978.50 : x
2. Step 2: Convert to fraction form
   11,955.87/16,501.86 = 7,978.50/x
3. Step 3: Cross multiply
   11,955.87x = 16,501.86 × 7,978.50
4. Step 4: Simplify right side
   11,955.87x = 131,660,090.01
5. Step 5: Solve for x
   x = 131,660,090.01/11,955.87
6. Step 6: Final answer
   x = 11,012.17