Finding the Fourth Proportional to 11,620.31, 16,038.56 and 7,147.90

Step by Step Solution

1. Step 1: Write the proportion equation
   11,620.31 : 16,038.56 = 7,147.90 : x
2. Step 2: Convert to fraction form
   11,620.31/16,038.56 = 7,147.90/x
3. Step 3: Cross multiply
   11,620.31x = 16,038.56 × 7,147.90
4. Step 4: Simplify right side
   11,620.31x = 114,642,023.02
5. Step 5: Solve for x
   x = 114,642,023.02/11,620.31
6. Step 6: Final answer
   x = 9,865.66