Finding the Fourth Proportional to 10,641.98, 15,977.07 and 9,091.94

Step by Step Solution

1. Step 1: Write the proportion equation
   10,641.98 : 15,977.07 = 9,091.94 : x
2. Step 2: Convert to fraction form
   10,641.98/15,977.07 = 9,091.94/x
3. Step 3: Cross multiply
   10,641.98x = 15,977.07 × 9,091.94
4. Step 4: Simplify right side
   10,641.98x = 145,262,561.82
5. Step 5: Solve for x
   x = 145,262,561.82/10,641.98
6. Step 6: Final answer
   x = 13,649.96