Finding the Fourth Proportional to 9,991.95, 13,788.82 and 5,454.61

Step by Step Solution

1. Step 1: Write the proportion equation
   9,991.95 : 13,788.82 = 5,454.61 : x
2. Step 2: Convert to fraction form
   9,991.95/13,788.82 = 5,454.61/x
3. Step 3: Cross multiply
   9,991.95x = 13,788.82 × 5,454.61
4. Step 4: Simplify right side
   9,991.95x = 75,212,700.71
5. Step 5: Solve for x
   x = 75,212,700.71/9,991.95
6. Step 6: Final answer
   x = 7,527.33