Finding the Fourth Proportional to 10,191.72, 15,262.88 and 5,180.91

Step by Step Solution

1. Step 1: Write the proportion equation
   10,191.72 : 15,262.88 = 5,180.91 : x
2. Step 2: Convert to fraction form
   10,191.72/15,262.88 = 5,180.91/x
3. Step 3: Cross multiply
   10,191.72x = 15,262.88 × 5,180.91
4. Step 4: Simplify right side
   10,191.72x = 79,075,607.62
5. Step 5: Solve for x
   x = 79,075,607.62/10,191.72
6. Step 6: Final answer
   x = 7,758.81