Finding the Fourth Proportional to 10,328.78, 15,491.13 and 5,061.56

Step by Step Solution

1. Step 1: Write the proportion equation
   10,328.78 : 15,491.13 = 5,061.56 : x
2. Step 2: Convert to fraction form
   10,328.78/15,491.13 = 5,061.56/x
3. Step 3: Cross multiply
   10,328.78x = 15,491.13 × 5,061.56
4. Step 4: Simplify right side
   10,328.78x = 78,409,206.51
5. Step 5: Solve for x
   x = 78,409,206.51/10,328.78
6. Step 6: Final answer
   x = 7,591.34